I like a lot the implementation of the theme, and the juice is there, even with very minimalistic graphics. I wish it was a bit easier especially at the start, the first games are a bit too quick to be enjoyable, the player needs a bit more time to adapt to the gameplay. But once you get the hang of it, it's really fun !
Just a quick nitpick, I think the bullets and player hitboxes could be a bit smaller, and the collectable a bit bigger, because I sometimes had trouble to touch the collectables, and dodging feels a bit hard sometimes.
Well done !