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It's quite the thing to setup and score a point, and quite a lot of fun to do it. Really clever mechanic and it's fun to try and wrap your brain around it.

My only complaint sounds sort of silly, but I spent an awful long time trying to push enemies into the graphical side of the walls thinking it would do something. Especially the spiked wall. 

thats a totally reasonable complaint! You don't have anything to base the mechanics on except for the art on screen, and it is telling you something different than what is happening.