DAMN this is clean.
The gameplay here is very solid and enjoyable (i like the fact you can choose what and where to go here), the art looks amazing (I'll ignore the fact you used more than 4 colors simply due to how amazing this is and that it's on an actual gameboy) and the music ooooooohhhh myyyy. This is yet another one of the very smol selection of games in this jam that 1) run on an actual gameboy and 2) has music that utilises ALL the gameboy's channels effectively (aka 2 pulse, 1 wave, and 1 noise). Whoever made the music here, you deserve a medal for this.
My only smol complaint is that the boss takes 9 hits to defeat, which is very easy to do lol.
Still, this game is outstanding! Well done!