Unexpectedly, Metroid!
Everything is really cool and great. The only thing I can say (besides the hitboxes, which have already been mentioned) is that I was a bit confused by the jump - you often can't see where it's supposed to land. And I often hit my head on mobs, haha. But maybe this plays into the Gameboy aesthetic and was intended that way?
In any case, this won't affect the rating, the customization in the game is very thematic, I liked it