I really like those arena games since the basic gameplay loop is pretty quick to set up and you have more time for polishing which shows with this one as well. Object, character and enemy design is great and the soundtrack made me want to play another and another round. A few things I found a little frustrating:
1. The border of the map is not the border of the game which lead to game overs even though I should have had room to dodge.
2. The sprites are quite big for the screen which leaves very little time to dodge incoming enemies. For me personally: playing with the keyboard I was a little to slow to react. With gamepad it was fine though so maybe I just have bad reaction time :)
Overall great job getting so many assets done in such a short amount of time!
Btw: Huh, I got 13 oddities and then couldn't find anymore ;)