It is really hard to tell the Pick Ups and the Score Text apart from the Ground (in some Levels). I would also make the Despawn Time of the Enemy Bullets a bit longer and their Speed a bit slower, so that the Player needs to dodge them. Right now you can walk away from the Enemy and shoot from there, without the Bullets reaching you. But overall it was a really fun Game with a really nice Difficulty. I was barely able to make it!