Cool concept! I think you should have introduced the green orb sooner, it was definitely a moment where I got to be like 'oh cool, I see what works about this design' when I realised there'd be multiple things in the level to avoid with the red cubes. I wish the instructions had been a liiiiiitlle clearer, it made it pretty hard to work out what I was doing on the first level.
Also I wish the music didn't restart its loop each time I died!