Graphics are incredible! My feedback on that would be to do a slightly different camera angle perhaps that doesn't feel so distant to the action. Perhaps a dynamic camera that gets up close and personal while you are bouncing around, but as soon as you hold down to charge you get a wider view of the situation, and then release and are thrown back into the action.
Other than that, the actual gameplay isn't particularly exciting or original to me, but perhaps having slightly more enemies such that insane combos become a more regular thing would make it feel more enticing. Some more positive feedback for the player such as ascending tones for each thing you hit in succession.
Well done overall! You worked hard and it shows!