rely on stringification instead of state reports

src/projectile.js

@@ -52,12 +52,6 @@ export default class Projectile {
     this.game?.despawn(this)
   }
 
-  state() {
-    return {
-      ...this,
-    }
-  }
-
   update() {
     this.#move()
     if (this.onCollide != null) { this.checkCollisions(this.collider()) }