This is an absolutely excellent submission, top marks from me. The scope was kept pretty low allowing you to pretty much polish everything! I loved how all the effects were perfectly in beat with the music and the spell sound effects became part of the music as a result. The art style is charming and everything pulsing to the beat just really sells the whole effect. I love how the powers can interact with each other, and getting two volume ups at the start of the loop is really strong. I found that if I used the fireball on the 7th beat, it seemed to last the entire next measure since the fireball didn't land until the next measure started.
All I think I could ask is for an endless mode so you can see how busted combos can eventually get.
Excellent job!