refactor: remove some unused declarations/imports

src/games/platformerTest.ts

@@ -1,10 +1,8 @@
-import { Scene, Game, WEBGL, GameObjects, Physics } from 'phaser'
+import { Scene, GameObjects} from 'phaser'
 const WIDTH = 256
 const HEIGHT = 240
 const GRAVITY = 128
 
-const canvas = document.getElementById('game') as HTMLCanvasElement
-
 interface IPlayer extends Phaser.Types.Physics.Arcade.SpriteWithDynamicBody {
   brakingInfo: {
     isBraking: boolean