Great game, good job on getting it to run on the Gameboy! It looks great, and plays well, but the left and right movement frustrated me a bit because of how long it takes to accelerate. I also hated how much I would bump my head and fall right into the water because I underestimate the jump height as well. As for music, it's not that bad, but if you want to get better at making music that would work well with a Gameboy I recommend using LSDJ. The UI is a bit hard to navigate but once you learn it it's really easy to use and it can also run on the Gameboy and uses the sound chips from it. Anyways, good job!