I feel stupid I didn't give your entry a try earlier! I was kinda saving a moment to play it because it looked kinda hard based on the screenshots and all. but it was somehow very intuitive and I played through a lot of levels in one sit.
I know you took your time to polish a lot of features, but the only thing I missed was a bit more explanation regarding power ups and how they help with a few mechanics. But other than that, the gameboy feeling is undeniable. The audio sounds 100% like a gameboy game and so does the animations and tiles. Great game!