Quite an enjoyable game with some fun mechanics. Though the collecting of boxes feels unimportant apart from just for scoring - which is fine for a quick game jam - but could give rewards if the game was further developed. Furthermore, the floating islands in the background are a good detail but slightly confusing since I kept avoiding them thinking they'd slow me down or trap me into hitting a laser - I would say make the islands physical objects to improve the gameplay features now where you have to avoid being delayed by the floating island or be forced down a specific path with increased difficulty. Also, as Sam was saying, it would be worth making the game infinitely-scrolling through generation, would be more fun that way. But a solid game all the same, seems very promising.