It's amazing that you managed to implement three different characters in such a short time. I tried that too, but unfortunately i couldn't manage it anymore. That's why you already have my respect on that.
The presentation is very simple, but decent. Kind of reminds me of castle crashers, i don't know why.
Very creative that each character only has a certain number of moves, before you have to change and then attack enemies to fill the bar of the next character. You force the player to rotate the characters constantly, which is very nice.
The arrows of the archer however, were a bit too fast for me, i could never make use of the block.
Overall i think this is a good submission. Great work.