I agree with the others, the premise is nice, there shops and stat systems are interesting, but the controls feel a bit too floaty and losing all speed after making contact with an enemy makes the game pretty punishing and, to me, less enjoyable to play. I found myself charging archers in level two, only to have no way to get back up to speed fast enough to evade subsequent "arrows". Some of the text is pretty small too (the menu, but also I missed the timer in the arena the first time :D).
But with all that said, I find it pretty impressive you pulled this off in a week, good job!