This weird game called Muse Dash randomly came up on steam last week.
It's a platformer / rhythm game where you beat down things as the music rolls. Probably the closest thing i can think of is dance dance revolution at the arcade.
I suck at games based on rhythm, but it's fun. It has infinite potential because they seem to just release more music tracks and scale the difficulty based on that music. I tried a psychedelic trance track and it was like bullet hell.
You can also unlock more avatars and pets. The default avatar features Rin bashing things with her electric guitar.
Overall a strange, but enjoyable game.