The visual are really cool in your game. Looks perfectly polished game. I loved the idea of switching colors with multiple taps of same button. I am not sure how you achieved that. I am guessing you start a timer on first press and count the number of subsequent inputs before the time runs out. If you are doing something else please let me know. I too use Godot engine and would love to learn how you achieved color change with just one button.
That being said, I think you can tweak the gameplay a little to make sure that players get enough time to identify the color before crashing. While I was playing, I constantly kept on losing some health whenever the colors changed. Also, I am a little color blind, so it was difficult for me to see the difference between blue and red. :-p
Just a side note, I saw multiple error in the terminal window. All of them were for some missing methods. I think this happens only when player crashes and restarts the game. Are some unnecessary signals being emitted?
ERROR: emit_signal: Error calling method from signal 'animation_finished': 'Spatial(Spatial.gd)::_on_AnimationPlayer_animation_finished': Method not found..
Anyways, I really like this game for the visuals. There isn't much time left, but if you update the game, let me know. I'd love to give it another go. :-)