I do understand your feelings about the sounds. I totally agree those don't sound like a GameBoy, and I'm sorry about that. I was about to use Starlight song by Nicole Marie, but I removed it since it was against the rule to use assets that were not made during the jam. It's probably the biggest mistake I made during this jam. So, one day before I submit my entry I had to find someone who would make music for me in such a short time. I do agree it doesn't fit to GameBoy, but I didn't want to release the game without music.
I should read rules more carefully next time..
About the ROM version - Yes, I wish to create it for the full version of the game. I need to find out how I will make similar puzzle mechanics in GB Studio first. Thanks for the good vibes, and motivation!