The idea is original and well executed !
There are some technical details , like the red enemies seemingly having much better movement than the player and some glitching through walls / roofs that didn't seem intentional ?
The art is simple but very effective. The only real problem I'd say is that there's not a huge sense of progression, maybe there could be some things to unlock to change the gameplay after a few levels ?
All in all great job though i really enjoyed it !