diff --git a/rogueviz/ads/ads-game.cpp b/rogueviz/ads/ads-game.cpp
index b94c1f62..c19fd400 100644
--- a/rogueviz/ads/ads-game.cpp
+++ b/rogueviz/ads/ads-game.cpp
@@ -3,9 +3,9 @@
 #include "math.cpp"
 #include "globals.cpp"
 #include "shapes.cpp"
+#include "resources.cpp"
 #include "map.cpp"
 #include "control.cpp"
-#include "resources.cpp"
 #include "display.cpp"
 #include "menu.cpp"
 
diff --git a/rogueviz/ads/control.cpp b/rogueviz/ads/control.cpp
index 9537820c..755a3e7a 100644
--- a/rogueviz/ads/control.cpp
+++ b/rogueviz/ads/control.cpp
@@ -5,6 +5,8 @@ namespace ads_game {
 vector<string> move_names = { "acc down", "acc left", "acc up", "acc right", "fire", "pause", "display times", "switch spin", "menu" };
 
 void fire() {
+  if(!pdata.ammo) return;
+  pdata.ammo--;
   auto g = hybrid::get_where(vctr);
   auto c = g.first;
   if(g.second != 0) println(hlog, "WARNING: vctr not zeroed");
@@ -132,15 +134,27 @@ bool ads_turn(int idelta) {
     bool up = a[16+2];
     bool down = a[16];
     
-    if(left) apply_lorentz(lorentz(0, 2, delta*accel)), ang = 180;
-    if(right) apply_lorentz(lorentz(0, 2, -delta*accel)), ang = 0;
-    if(up) apply_lorentz(lorentz(1, 2, delta*accel)), ang = 90; 
-    if(down) apply_lorentz(lorentz(1, 2, -delta*accel)), ang = 270;
+    int clicks = (left?1:0) + (right?1:0) + (up?1:0) + (down?1:0);
+
+    if(left && right) left = right = false;
+    if(up && down) up = down = false;
+    
+    if(left) ang = 180;
+    if(right) ang = 0;
+    if(up) ang = 90; 
+    if(down) ang = 270;
     
     if(left && up) ang = 135;
     if(left && down) ang = 225;
     if(right && up) ang = 45;
     if(right && down) ang = 315;
+    
+    ld mul = clicks ? 1 : 0;
+    if(clicks > 2) mul *= .3;
+    if(pdata.fuel < 0) mul = 0;
+
+    apply_lorentz(spin(ang*degree) * lorentz(0, 2, -delta*accel*mul) * spin(-ang*degree));
+    pdata.fuel -= delta*accel*mul;
 
     current.T = cspin(3, 2, pt) * current.T;
     optimize_shift(current);    
@@ -152,6 +166,11 @@ bool ads_turn(int idelta) {
       ang += pt / degree;
 
     ship_pt += pt;
+    pdata.oxygen -= pt;
+    if(pdata.oxygen < 0) {
+      pdata.oxygen = 0;
+      game_over = true;
+      }
     }
   
   fixmatrix_ads(current.T);
diff --git a/rogueviz/ads/display.cpp b/rogueviz/ads/display.cpp
index e4242b7b..89c7c9a7 100644
--- a/rogueviz/ads/display.cpp
+++ b/rogueviz/ads/display.cpp
@@ -209,7 +209,13 @@ bool view_ads_game() {
 
     if(true) {
       poly_outline = 0xFF;
-      queuepolyat(shiftless(spin(ang*degree) * Id), shShip, 0x2020FFFF, PPR::LINE);
+      color_t shipcolor = 0x2020FFFF;
+      if(ship_pt < invincibility_pt) {
+        ld u = (invincibility_pt-ship_pt) / how_much_invincibility;
+        poly_outline = gradient(shipcolor, rsrc_color[rtHull], 0, 0.5 + cos(5*u*TAU), 1);
+        }
+      queuepolyat(shiftless(spin(ang*degree) * Id), shShip, shipcolor, PPR::LINE);
+      poly_outline = 0xFF;
 
       if(view_proper_times) {
         string str = format(tformat, ship_pt / TAU);
diff --git a/rogueviz/ads/globals.cpp b/rogueviz/ads/globals.cpp
index d0d6d72b..b84a17e1 100644
--- a/rogueviz/ads/globals.cpp
+++ b/rogueviz/ads/globals.cpp
@@ -26,6 +26,9 @@ ld ang = 0;
 /** ship's current proper time */
 ld ship_pt;
 
+/** until when is the ship invincible */
+ld invincibility_pt;
+
 /** is the game paused */
 bool paused;
 
@@ -45,6 +48,8 @@ vector<struct ads_object*> displayed;
 
 color_t missile_color = 0xFF0000FF;
 
+bool game_over;
+
 struct player_data {
   int hitpoints;
   int score;
@@ -53,6 +58,8 @@ struct player_data {
   ld oxygen;
   };
 
+ld how_much_invincibility = TAU / 4;
+
 player_data pdata, max_pdata, tank_pdata;
 
 }}
diff --git a/rogueviz/ads/map.cpp b/rogueviz/ads/map.cpp
index 72e244c0..a5ffbfcd 100644
--- a/rogueviz/ads/map.cpp
+++ b/rogueviz/ads/map.cpp
@@ -4,13 +4,6 @@ namespace ads_game {
 
 enum eObjType { oRock, oMissile, oParticle, oResource };
 
-enum eResourceType { rtNone, rtHull, rtGold, rtAmmo, rtFuel, rtOxygen };
-
-color_t rock_color[6] = { 0x703800FF, 0xC0A080FF, 0xC08010FF, 0xC04000FF, 0x408000FF, 0x8040A0FF,  };
-color_t rsrc_color[6] = {0, 0xC0C0C0FF, 0xFFD500FF, 0xFF0000FF, 0x00FF00FF, 0x0000FFFF };
-
-vector<ld>* rsrc_shape[6] = { nullptr, &shape_heart, &shape_gold, &shape_weapon, &shape_fuel, &shape_airtank };
-
 struct ads_object {
   eObjType type;
   eResourceType resource;
@@ -172,34 +165,47 @@ void gen_resource(cell *c, shiftmatrix from, eResourceType rsrc) {
   r->shape = rsrc_shape[rsrc];
   r->life_end = HUGE_VAL;
   r->life_start = 0;
+  r->resource = rsrc;
   ci_at[c].rocks.emplace_back(std::move(r));
   }
 
+bool pointcrash(hyperpoint h, const vector<cross_result>& vf) {
+  int winding = 0;
+  vector<hyperpoint> kleins;
+  for(auto& p: vf) kleins.push_back(kleinize(p.h) - h);
+  auto take = [&] (hyperpoint& a, hyperpoint& b) {
+    if(asign(a[1], b[1]) && xcross(b[0], b[1], a[0], a[1]) < 1e-6)
+      winding++;
+    };
+  for(int i=1; i<isize(kleins); i++) take(kleins[i-1], kleins[i]);
+  take(kleins.back(), kleins[0]);
+  return winding & 1;
+  }
+
+void crash_ship() {
+  if(ship_pt < invincibility_pt) return;
+  invincibility_pt = ship_pt + how_much_invincibility;
+  pdata.hitpoints--;
+  if(pdata.hitpoints <= 0) game_over = true;
+  }
+
 void handle_crashes() {
   vector<ads_object*> missiles;
   vector<ads_object*> rocks;
+  vector<ads_object*> resources;
   for(auto m: displayed) {
     if(m->type == oMissile)
       missiles.push_back(m);
     if(m->type == oRock)
       rocks.push_back(m);
+    if(m->type == oResource)
+      resources.push_back(m);
     }
   hybrid::in_underlying_geometry([&] {
     for(auto m: missiles) {
       hyperpoint h = kleinize(m->pt_main.h);
       for(auto r: rocks) {
-        int winding = 0;
-        vector<hyperpoint> kleins;
-        for(auto& p: r->pts) kleins.push_back(kleinize(p.h) - h);
-        auto take = [&] (hyperpoint& a, hyperpoint& b) {
-          if(asign(a[1], b[1]) && xcross(b[0], b[1], a[0], a[1]) < 1e-6)
-            winding++;
-          };
-        for(int i=1; i<isize(kleins); i++) take(kleins[i-1], kleins[i]);
-        take(kleins.back(), kleins[0]);
-        if(winding & 1) {
-          println(hlog, "winding = ", winding);
-          println(hlog, "kleins = ", kleins);
+        if(pointcrash(h, r->pts)) {
           m->life_end = m->pt_main.shift;
           r->life_end = r->pt_main.shift;
           hybrid::in_actual([&] {
@@ -210,6 +216,18 @@ void handle_crashes() {
           }
         }
       }
+    for(int i=0; i<isize(shape_ship); i+=2) {
+      hyperpoint h = kleinize(hpxyz(shape_ship[i], shape_ship[i+1], 1));
+      for(auto r: rocks) {
+        if(pointcrash(h, r->pts)) crash_ship();
+        }
+      for(auto r: resources) {
+        if(pointcrash(h, r->pts)) {
+          r->life_end = r->pt_main.shift;
+          gain_resource(r->resource);
+          }
+        }
+      }
     });
   }
 
diff --git a/rogueviz/ads/resources.cpp b/rogueviz/ads/resources.cpp
index 5347b617..b28f9869 100644
--- a/rogueviz/ads/resources.cpp
+++ b/rogueviz/ads/resources.cpp
@@ -2,6 +2,13 @@ namespace hr {
 
 namespace ads_game {
 
+enum eResourceType { rtNone, rtHull, rtGold, rtAmmo, rtFuel, rtOxygen };
+
+color_t rock_color[6] = { 0x703800FF, 0xC0A080FF, 0xC08010FF, 0xC04000FF, 0x408000FF, 0x8040A0FF,  };
+color_t rsrc_color[6] = {0, 0xC0C0C0FF, 0xFFD500FF, 0xFF0000FF, 0x00FF00FF, 0x0000FFFF };
+
+vector<ld>* rsrc_shape[6] = { nullptr, &shape_heart, &shape_gold, &shape_weapon, &shape_fuel, &shape_airtank };
+
 void init_rsrc() {
   max_pdata.hitpoints = 3;
   max_pdata.score = 0;
@@ -52,13 +59,15 @@ void display(int id, int y, ld val, ld maxv, ld tank, ld unit) {
   curvepoint(atscreenpos(sta, top, 1) * C0);
   queuecurve(sId, col, col - 128, PPR::ZERO);
   
-  ld end = sta + siz * val / maxv;
-  curvepoint(atscreenpos(sta, top, 1) * C0);
-  curvepoint(atscreenpos(end, top, 1) * C0);
-  curvepoint(atscreenpos(end, bot, 1) * C0);
-  curvepoint(atscreenpos(sta, bot, 1) * C0);
-  curvepoint(atscreenpos(sta, top, 1) * C0);
-  queuecurve(sId, col, col, PPR::ZERO);
+  if(val > 0) {
+    ld end = sta + siz * val / maxv;
+    curvepoint(atscreenpos(sta, top, 1) * C0);
+    curvepoint(atscreenpos(end, top, 1) * C0);
+    curvepoint(atscreenpos(end, bot, 1) * C0);
+    curvepoint(atscreenpos(sta, bot, 1) * C0);
+    curvepoint(atscreenpos(sta, top, 1) * C0);
+    queuecurve(sId, col, col, PPR::ZERO);
+    }
   
   if(unit) for(ld u=unit; u<maxv-1e-3; u+=unit) {
     ld at = sta + siz * u / maxv;
@@ -95,4 +104,14 @@ void display_rsrc() {
   quickqueue();
   }
 
+void gain_resource(eResourceType rsrc) {
+  #define D(id, field) if(rsrc == id) { pdata.field += tank_pdata.field; if(max_pdata.field && pdata.field > max_pdata.field) pdata.field = max_pdata.field; }
+  println(hlog, "gain resource ", int(rsrc));
+  D(1, hitpoints)
+  D(2, score)
+  D(3, ammo)
+  D(4, fuel)
+  D(5, oxygen)
+  }
+
 }}