Love how simple this game is! I think it would be a great addition adding a timer on each level. It would be a really great speedrunning game. Rotating the camera is a great addition as well.
I do think that the blue guys aren't as threatening as they should be.
Maybe getting rid of the health bar so you have to full reset the level if you hit them could add a bit more of a challenge. Could work well in a speedrunning setting
It's a great game and love the visuals. Super fun! Keep it up!