diff --git a/src/main.rs b/src/main.rs
index de25351..706f496 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -11,6 +11,7 @@ mod map;
 mod player;
 mod off_map;
 mod enemy;
+mod projectile;
 
 #[derive(PhysicsLayer)]
 pub enum Layer {
@@ -38,6 +39,7 @@ fn main() {
         .add_system(player::input.after("input"))
         .add_system(off_map::check)
         .add_system(enemy::walk)
+        .add_system(projectile::collide)
         .add_system(exit_on_escape)
         // .add_system(log_collisions)
         .run();
diff --git a/src/map.rs b/src/map.rs
index 7f4afe6..dee6477 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -8,6 +8,7 @@ use crate::{
     enemy::Enemy,
     player::Player,
     off_map::CanFallOffMap,
+    projectile::EGG_RADIUS,
     Layer,
 };
 
@@ -101,7 +102,7 @@ pub fn setup(
         bridge_material: materials.add(Color::rgb(0.5, 0.4, 0.1).into()),
         egg_material: materials.add(Color::rgb(1.0, 1.0, 0.9).into()),
         egg_mesh: meshes.add(Mesh::from(shape::Icosphere {
-            radius: crate::player::EGG_RADIUS,
+            radius: EGG_RADIUS,
             subdivisions: 8,
         })),
         last_build: None,
@@ -326,7 +327,7 @@ fn add_island(
                     })
                     .insert(PhysicMaterial {
                         restitution: 1.0,
-                        density: 500.0,
+                        density: 300.0,
                         friction: 0.0,
                     })
                     .insert(RotationConstraints::lock())
@@ -335,7 +336,7 @@ fn add_island(
                     .insert(CanFallOffMap)
                     .insert(Enemy {
                         rotation: 0.0,
-                        bounds: (translation.x - half_extends.x + 1.0..=translation.x + half_extends.x - 1.0, translation.z - half_extends.z + 1.0..=translation.z + half_extends.z - 1.0),
+                        bounds: (translation.x - half_extends.x + 0.5..=translation.x + half_extends.x - 0.5, translation.z - half_extends.z + 0.5..=translation.z + half_extends.z - 0.5),
                         patrol_target: None,
                     })
                     .with_children(|children| {
diff --git a/src/player.rs b/src/player.rs
index 8f2deb5..a1881be 100644
--- a/src/player.rs
+++ b/src/player.rs
@@ -6,11 +6,10 @@ use crate::{
     input::{InputState, Key, Source as InputSource},
     map::GroundContact,
     off_map::CanFallOffMap,
+    projectile::{EGG_RADIUS, Projectile},
     Layer,
 };
 
-pub const EGG_RADIUS: f32 = 0.15;
-
 #[derive(Component)]
 pub struct Player {
     input_source: InputSource,
@@ -116,7 +115,7 @@ pub fn input(
             1.2
         } else if x != 0.0 || z != 0.0 {
             // walk bobbing
-            0.2
+            0.3
         } else {
             0.0
         };
@@ -145,7 +144,7 @@ pub fn input(
         && input.keys.contains(&(player.input_source.clone(), Key::Shoot))
         {
             let direction = Quat::from_rotation_y(player.rotation) * Vec3::Z;
-            let mut transform = Transform::from_translation(transform.translation + 0.5 * direction);
+            let mut transform = Transform::from_translation(transform.translation + 1.0 * direction);
             transform.scale += 0.3 * direction;
             commands.spawn()
                 .insert(RigidBody::Dynamic)
@@ -157,11 +156,12 @@ pub fn input(
                     radius: EGG_RADIUS,
                 })
                 .insert(PhysicMaterial {
-                    restitution: 0.0,
-                    density: 20_000.0,
+                    restitution: 1.0,
+                    density: 10_000.0,
                     friction: 1.0,
                 })
-                .insert(Velocity::from_linear(20.0 * direction))
+                .insert(Velocity::from_linear(30.0 * direction))
+                .insert(Projectile)
                 .insert(CanFallOffMap)
                 .insert(GlobalTransform::default())
                 .insert_bundle(PbrBundle {
diff --git a/src/projectile.rs b/src/projectile.rs
new file mode 100644
index 0000000..39bfc4a
--- /dev/null
+++ b/src/projectile.rs
@@ -0,0 +1,43 @@
+use std::collections::HashMap;
+use rand::prelude::*;
+use bevy::{
+    prelude::*,
+};
+use heron::prelude::*;
+use crate::{
+    player::Player,
+    Layer,
+};
+
+pub const EGG_RADIUS: f32 = 0.15;
+
+#[derive(Component)]
+pub struct Projectile;
+
+pub fn collide(
+    mut events: EventReader<CollisionEvent>,
+    mut velocities: Query<&mut Velocity>
+) {
+    fn is_projectile(layers: CollisionLayers) -> bool {
+        layers.contains_group(Layer::Projectile)
+    }
+
+    for event in events.iter() {
+        let (entity_1, entity_2) = event.rigid_body_entities();
+        let (layers_1, layers_2) = event.collision_layers();
+        if is_projectile(layers_1) {
+            let projectile_velocity = velocities.get(entity_1)
+                .expect("entity_1");
+            if let Ok(mut velocity) = velocities.get_mut(entity_2) {
+                *velocity.linear = (Vec3::from(*velocity.linear) + Vec3::from(*projectile_velocity.linear)).into();
+            }
+        }
+        if is_projectile(layers_2) {
+            let projectile_velocity = velocities.get(entity_2)
+                .expect("entity_2");
+            if let Ok(mut velocity) = velocities.get_mut(entity_1) {
+                *velocity.linear = (Vec3::from(*velocity.linear) + Vec3::from(*projectile_velocity.linear)).into();
+            }
+        }
+    }
+}