It's seems like a game has a some of optimization problems when yoo many enemies arrived but game is in alpha so that's okay.
It would be better if you use WASD for movement input and add more attack animation to character.(It's just my opinion:D
Lastly, I really like your game design (especially UI design cause of some of indie devs do not care that too much).
I hope more people'll play this game, good job dude :)
You can send me a PM if you want to talk about game dev stuff.