use gamestates and assetloader

src/keys.rs

@@ -1,5 +1,6 @@
 use crate::{
-    billboards::Billboard, player::Player, sounds::PlaySound, squish_animation::SquishAnimation,
+    GameState, billboards::Billboard, player::Player, sounds::PlaySound,
+    squish_animation::SquishAnimation,
 };
 use avian3d::prelude::*;
 use bevy::prelude::*;
@@ -16,7 +17,7 @@ struct Key(pub String);
 pub struct KeyCollected(pub String);
 
 pub fn plugin(app: &mut App) {
-    app.add_systems(Update, collect_key);
+    app.add_systems(Update, collect_key.run_if(in_state(GameState::Playing)));
     app.add_observer(on_spawn);
 }