Wow, it is cool to see what someone with a bit more skill can do on GB Studio! I also made my first ever game on GB Studio with a similiar type of gameplay but you really nailed the art, music, GB soul, fun, EVERYTHING! I didn't beat it because there are a lot of games to get through but I plan on going through and beating it when I have the time! Super well made game!
P.S. Give me music pointers :P