I like the music! I've seen the dual character, one input system theme many times before, even outside of this jam, but most are top down or 3D (Captain Toad, double cherry levels). The platformer was neat.
I had some collision errors, and it doesn't seem like I can restart a stage after losing, but the concept is neat. I liked the stage where you need to jump against the wall over a pit to bring the characters together.
Best of luck in the jam!