The game was... ok. Both of the implementations (theme and SO) were good, and the visual side was also nice. However it is clear that the game was not polished, as the enemies constantly get stuck in walls, ground and one of my enemies got sent literally to heaven. Also, there isn't much to do other than attack with your guitar some glitchy cubes. And the audio is kinda annoying.
However, looking at how this is your first game jam submission, then it wasn't that bad. It does need improvement, but that's literally what game jams are for - to learn.
Overall, 3/5 stars. A pretty good start for a game-jammy career.
Good luck on your next project(s)! :]
(PS. if you can, I would appreciate you playing and rating my game)