I really enjoyed the controls! The movements feel super nice and are really responsive. Also, the enemies are surprisingly intelligent for a jam game, even going as far as jumping to get you. I really liked it. But I wish there were more levels. The arena is interesting, but I think the game lends itself better to having more levels.
I found something you may want to fix, though: if you kill an enemy that can be rewinded in the arena, move left so you rewind time just enough for them to revive, then move right and kill them again, the same enemy will give you more than one point. I racked up 50 kills with a single enemy, and I don't think this was intentional!
But overall it's a solid game. Good job!