Congratulations on your first Jam and so far as I could tell actually completing it. Had way more of the things they wanted for the jam than mine did. LOL
Liked the sound and music, graphics and that all fit the GB feel. Well done.
Gameplay was a bit too slow for me, I wished the player moved a bit quicker. I might have played longer to see the space filling up part of this. Or maybe added some sort of difficulty to it beyond the space filling aspect.
But again, great job on your first Jam. :)