I don't know if you intentionally do it or not (and somehow, i think that you do), but red and green are too contrasting to the point that it hurts the eyes. If that your goal, then you do it so well! but if not, I recommend you should use different color combination or if you want to stick to red-green combination, it would be best if you use darker tone colors, avoid using neon color or add some neutral color like white/gray/black.
The enemies are too much for my liking, even though you have a tutorial but it's still a bit confusing to understand and adapt to the control. Maybe you can add some visuals in the tutorial so that players can understand it better.