Now this, is peak Gameboy aesthetic!
I (sadly) haven't beaten this gane, but from the small bits I have played, this could definitely become a very good (homebrew) gameboy game!
This art is beautiful, and the music, while definitely not a absolute banger, is definitely nice enough, fit with the environments, and use the gameboy's 4 channels nicely (though I'm not sure whether the wave channel was used for bass or smth but eh, who cares)
The only problem was that I experienced some minor lag in the world with caves and such that I forgot the name of, but besides that, it was very good :D
And even better that it is on the actual gameboy! Well done!