Really nice gameplay base and I loved the visual effects and the animation on the power attack!
Agreeing with Fluburbio, a small scoring system will turn this gameplay loop to an addictive game. However, this is a great base for the time constraints. I especially loved the idea of collecting the enemy's blood after their death.
A suggestion is that some audio effects could enhance the overall polishing of the game. However, I think the animations are already excellent.
Great job!