Cool game. Definitely stands out from other games in the Jam.
I understood how the game fits the Game Jam Theme well. The combat was rather enjoyable (mowing down waves of enemies is always fun), although it did get a bit (J) button mashy after a while.
In terms of art, it all looked very cohesive. I did appreciate the nice particle effects, especially at the end of a regular attack sequence. A shame the audio did not work.
In terms of improvements, I'd recommend making enemies spawn more in clumps. Later in the game I found I was only fighting a couple enemies at a time. The addition of a dash attack would also be nice, make the combat a bit more fluid and varied. Finally, I would recommend adding mouse support (e.g. Left Click Attack, Right Click Projectile, Spacebar ult, move mouse to control camera).
Overall, a strong submission. Nice job!