You know for your first game jam, there are a surprising number of little touches that you put in which show great potential, for example, the particle effects you used for the doors and the moving shadows on the floor (I think those were particles) are really nice. Also - hades looked pretty depressing thanks to the terrain at the bottom and the color choices. I didn't find the choice of a rollerball control to be bad, it adds to the difficulty because you can't stop in time.
I do have a few minor complaints. When you kill a demon, they break into a spinning heart piece which looks like a power up but it isn't. It's a little bit misleading. I have the same complaint about the spawn points where the demons come from - they look like doors/portals. I tried going through one and a demon spawned from there and killed me. I would change their color to red or something so that the player doesn't think the same thing I did.
Nice first jam!