diff --git a/src/classes/Asteroid.ts b/src/classes/Asteroid.ts
index 93b85c7..6a0d415 100644
--- a/src/classes/Asteroid.ts
+++ b/src/classes/Asteroid.ts
@@ -1,8 +1,11 @@
 import Phaser from 'phaser'
+import Bullet from '../classes/Bullet'
 
 export default class Asteroid extends Phaser.Physics.Arcade.Sprite {
-  static unbornAge = 1000 // asteroid can't kill player
-                          // if younger than 1000ms
+  // asteroid can't kill player
+  // if younger than unbornAge in ms
+  static unbornAge = 1000
+
   readonly wrapMargin = 30
 
   age = 0
@@ -30,11 +33,20 @@ export default class Asteroid extends Phaser.Physics.Arcade.Sprite {
 
   preUpdate(time: number, delta: number) {
     super.preUpdate(time, delta)
-    
+
     this.scene.physics.world.wrap(this, this.scale * this.wrapMargin)
     this.age += delta
   }
 
+  gotHit(me, bullet) {
+    if (!(bullet instanceof Bullet)) return
+    if (bullet.active == false) return
+
+    me.destroy() // TODO: use objects pool
+    bullet.setActive(false)
+    bullet.setVisible(false)
+  }
+
   private setRandomShade() {
     const color = new Phaser.Display.Color()
     color.randomGray(0xa0) //the darkest possible dye is 0xa0a0a0
diff --git a/src/classes/Ship.ts b/src/classes/Ship.ts
index 12dfa9f..f3c7815 100644
--- a/src/classes/Ship.ts
+++ b/src/classes/Ship.ts
@@ -1,6 +1,7 @@
 import Phaser from 'phaser'
 import Bullets from './Bullets'
 import Thruster from './Thruster'
+import Asteroid from './Asteroid'
 
 export default class Ship extends Phaser.Physics.Arcade.Sprite {
   readonly acceleration = 5
@@ -66,4 +67,13 @@ export default class Ship extends Phaser.Physics.Arcade.Sprite {
     this.scene.physics.world.wrap(this, this.wrapMargin)
     this.thruster.update(time, delta)
   }
+
+  gotHit(_, asteroid) {
+    if (!(asteroid instanceof Asteroid)) return
+
+    if (asteroid.age > Asteroid.unbornAge) {
+      console.log("%cU ded", "color:red")
+      this.scene.cameras.main.shake(100, 0.02)
+    }
+  }
 }
diff --git a/src/scenes/DefaultScene.ts b/src/scenes/DefaultScene.ts
index 97b8bd2..76d0c9a 100644
--- a/src/scenes/DefaultScene.ts
+++ b/src/scenes/DefaultScene.ts
@@ -3,10 +3,11 @@ import Ship from '../classes/Ship'
 import Asteroid from '../classes/Asteroid'
 
 export default class DefaultScene extends Phaser.Scene {
-  readonly maxGameObjects = 100
+  readonly maxAsteroids = 70
 
   player?: Ship
   rotFrames?: Phaser.Types.Animations.AnimationFrame[]
+  asteroids?: Phaser.GameObjects.Group
 
   constructor() {
     super('default-scene')
@@ -22,6 +23,8 @@ export default class DefaultScene extends Phaser.Scene {
   }
 
   create() {
+    this.asteroids = this.add.group()
+
     Asteroid.createAnimations(this)
     this.add.image(400, 300, 'sky')
 
@@ -32,10 +35,28 @@ export default class DefaultScene extends Phaser.Scene {
       callbackScope: this,
       repeat: -1
     });
+
+    this.hookupCollisions()
   }
 
   spawnAsteroids() {
-    if (this.children.length < this.maxGameObjects)
-      new Asteroid(this)
+    if (this.asteroids!.getLength() < this.maxAsteroids)
+      this.asteroids!.add(new Asteroid(this))
+  }
+
+  hookupCollisions() {
+    // player - asteroids
+    this.physics.add.overlap(
+      this.player!, this.asteroids!, // colliders
+      this.player!.gotHit, // callback
+      undefined, // callback filter
+      this.player // 'this' for callback
+    )
+
+    // bullets - asteroids
+    this.physics.add.overlap(
+      this.asteroids!, this.player!.bullets,
+      Asteroid.prototype.gotHit
+    )
   }
 }