Very original! Some pieces of advice:
- Make it more obvious which enemies will be affected by which color (by coloring them red/blue/both for example
- Add just a little bit of variety in the music, the loop is too short, it gets distractingly repetitive
- Maybe a very short tutorial would be nice? In godot it is really easy to display a dialog with just a bit of text to explain what you have to do.
Good job!