put projectile movement updates into fixedupdate

src/abilities/gun.rs

@@ -30,7 +30,11 @@ pub fn plugin(app: &mut App) {
     app.add_systems(OnEnter(GameState::Playing), setup);
     app.add_systems(
         Update,
-        (update, shot_collision, timeout, enemy_hit).run_if(in_state(GameState::Playing)),
+        (shot_collision, enemy_hit).run_if(in_state(GameState::Playing)),
+    );
+    app.add_systems(
+        FixedUpdate,
+        (update, timeout).run_if(in_state(GameState::Playing)),
     );
 
     global_observer!(app, on_trigger_gun);
@@ -86,10 +90,10 @@ fn on_trigger_gun(
 
     commands.trigger(PlaySound::Gun);
 
-    let rotation = if let Some(target) = state.target {
-        let t = query_transform
-            .get(target)
-            .expect("target must have transform");
+    let rotation = if let Some(t) = state
+        .target
+        .and_then(|target| query_transform.get(target).ok())
+    {
         Transform::from_translation(state.pos)
             .looking_at(t.translation, Vec3::Y)
             .rotation

src/abilities/missile.rs

@@ -38,9 +38,10 @@ struct ShotAssets {
 
 pub fn plugin(app: &mut App) {
     app.add_systems(OnEnter(GameState::Playing), setup);
+    app.add_systems(Update, shot_collision.run_if(in_state(GameState::Playing)));
     app.add_systems(
-        Update,
-        (shot_collision, update, timeout).run_if(in_state(GameState::Playing)),
+        FixedUpdate,
+        (update, timeout).run_if(in_state(GameState::Playing)),
     );
 
     global_observer!(app, on_trigger_missile);