This is a cool concept! A bit clunky the first round, but I love rhythm games so this was worth the initial awkwardness. I think the control scheme is what made it difficult. Left Shift for casting works on the easier guys but once you face a like 10+ combination enemy it becomes a bit frustrating. I think changing the rhythm casting button to Right Click would have made it that much more fun. I could definitely see getting into a flow state with this one.
The visuals and audio were also great, really impressed by the overall atmosphere. A little bit of music would have been nice, though.
Great job!