Hmmm. Less about the controls and more that I'd prefer that the player was slightly faster than the enemies? instead of practically identical in speed. The number of enemies creates for enough challenge, but the option to run, make some room, and then attack would be nice. Otherwise, with little hp left, you are just running until you can't anymore and you die :')
But the controls are pretty tight. Changing it would be a matter of taste; I don't have anything objective to complain about.