The colors and audio is great! I wasn't able to play because I'm on a Mac but looks like a fun experience. The open goal format is definitely an avenue I want to go with my own games (I will eventually post a game lol).
Just going off of the video, I think it might be cool to experiment with some tighter areas that require slightly more precise maneuvering. I think it could give it some nice contrast to the open spaces that you have currently. Just something to try.