Really cool prototype to expand on! Took some time to get good and understand how to fight against NPCs. Once I got it - flawless completion.
Aesthetics and music are really pleasing. They really help to feel the flow with the game. My only negatives are HP system (don't see a point with 3 Hearts if you die in 2 hits in most situations) and hit registration, which is extremely hard to polish in jam.
Oh, and one more positive thing. I absolutely love HP indicators above NPCs. So simple, yet so understandable and easy to read for players.