I wasn't expecting a metroidvania, or at least something that feels like one! I was constantly surprised by each new ability you were able to add in such a short time. The level design was well thought out and clever how you added shortcuts on the way back. The only criticism I have is that it's very hard to see enemies and projectiles in full-screen, they become very tiny and hard to track with how fast the action is. Since the title screen also has a grey border to the right/bottom in full-screen I'm assuming that maybe your window scale mode is just set incorrectly and that you intended for the whole game to scale in full-screen rather than expand. If that's the case, switching the mode would probably address both issues. Still, incredible work!