You. Are. A. Maniac. The fact that you pulled that off alone is crazy to me. I mean, of course you used premade Assets but even that fact doesn't change how cool your game is.
It was fun and challenging at the same time and those little Thiefs gave me a nightmare with their left-to-right movement. Really well done. The Boss was also cool!
I don't know if that's intended but the Wizards (when they explode) everything around them dies? At least that happened a few times. Also the Wizard smoke explosion doesn't fit the style of the game. But that's just really, really minor issues I've seen. :)
I also would've wished for different Power-Ups or even a Shop where you can buy upgrades (more arrow etc) but die to the lack of time during a GameJam that's just a wish. :)
Really, well done man. You had good gameplay, a cool Menu, even an intro.