Some cool stuff in this game!
I love the colosseum feel, the smoke particles, and the POW that shows up when you hit enemies.
I like the look of lines on the screen when you move, but I think it's excessive for every time you move - I think that would be good to display when dashing or something like that.
The physics felt weird to me - I was flying around and bouncing off of walls. I think this type of game would fit better with snapper movement with more friction.
Congrats on your submission!