Interesting sandbox/proof-of-concept (PoC). Always a fan of cell-shading art style. It was cool to experiment with the 3 different attack styles (though blue is OP given that it's a ranged attack).
It was unclear to me when I could switch masks, so some indication would help. Given that this is more of PoC there are definitely other areas for improvement (e.g. hit feedback, gameplay loop), but this is a good base to build off.