Great game and fun concept!
few criticism's I have.
The shadows below the dog don't need to be that fine of detail. It would have been nice to be more pixely to match the rest of the aspect ratio of the game.
The idle animation of the character should have been done at sprite level instead of squishing the sprite. This breaks the illusion of it being a Gameboy game
Music was really well done! i just wish it was more chiptune/8bit to feel more Gameboy authenticity.