I made my prototipe for gameboy 'cause I used the jam as an excuse to try GB Studio, but I've found a couple of games for gameboy too, search for:
Legend of Carrot
PillaDream
The Saga of Sir Thimb
Plants Eat My Zombies
Love Always Runs Away.
Those are some of the actual gameboy games I've found that i really like and want to play on my GBC