Fun and great concept! few things
Sound. Wish the music was more 8bit sounding to feel more Gameboys'. but i know not everyone has the ability. Sounds in the game however were perfect.
Graphics. Some of the graphics looked beyond what would be possible on a 160x144 screen pixel density. The light beams looked way to clean on the edges to match the rest of the aesthetics of the game. So they felt a bit out of place with the rest of the graphics.