Hiya! I've played a little bit of this, pretty impressive so far. I've never used GB Studio myself so I don't know how easy it is to do this, but I really like how "legit" it seems--if I didn't know anything about it and someone just handed me the game already running, I don't think I'd be able to tell this was homebrew.
I feel like the whip is too slow, though. Usually in CV games, if I press attack right after pressing jump, I can reliably hit things above me, but in this case I'm already back on the ground, which makes things flow less well IMO. I'm also not a huge fan of the camera immediately swiveling around when you turn, but that might just be me.