Cool concept and awesome work! You have addicting gameplay + good challenge, nice music. I totally had fun with this game!
Some things that I want to mension though. I always expected, that hitbox of a character is somewhere in the bottom part of him, because he is perpendicular to the ground.
Also feels like game would be benefit from different obstacles every time you replay the wave. But that is only my thoughts )
Anyway, I beat it to the end and this game is already fun ) Good job!