I liked the rewind theme in your game, it's really nice the shadow following you and the effects when you use the "e".
Check out the default attack in idle, is always up. Maybe using the last direction you move, or the direction the character is facing at the moment you attack, would be better and make the game less difficult.
Another thing, probably the enemies are to fast attacking or there's to many enemies at the beginning of the game. I'm not a fan of lowering the difficulty to games, but maybe make them move or attack slower should be a good idea.
Anyway, your game has potential, you just have to polish it a little in my opinion :D