Wow, this is very impressive! The graphics and audio are amazing and the gameplay feels super solid!
My only nitpick is that it's hard to see the enemies against the background, which is something we struggled with as well. We ended up removing most details from textures, making them closer to a single solid color, which helped, but it's a bit of a trade-off. The zoom helped though, so that's a smart addition!
Excellent job!