Congrats! You managed to put a lot of content in the short timespan of the jam and as a solo dev!
I also think the music is great given it was made by yourself in this short amount of time. It would be much easy to just use stock music and don't tell about it, as others do.
Some constructive criticism:
Mage's weapon: If you are not planning of adding more levels where combat is more actively used, I would scrap the weapon mechanic for the wizard for this prototype. It bloats the amount of already confusing controls and it really doesnt gets applied in the level design. The couple of killable enemies in the levels are easily avoided by jumping over them.
Control layout: As they are right now they are quite confusing. It's almost like a single-keyboard-2-player game (that would work great btw). I'll simplify them as making the wizard only using the arrows+space for activating the monitors. And WASD+Q,E for the bat. (and even the bat could be simplified by removing the vertical control and adjusting the levels accordingly).
Level design: In the short timespan of a jam it gets really hard to design levels if you also do all the other work as a solo dev. That's why I think it wouldve better to scrap unused mechanics that werent quite applied into the levels. There were 2 levels that I managed to complete only using the wizard.
I really enjoyed the short experience.
Cheers!