Things I liked:
-Super fun combat!
-love the upgrades to make me feel more powerful!
-A boss battle?! That was amazing!
Things to improve:
-SFX, screen shake / other VFX, fonts, etc - general polish
-making those small enemies easier to see
-having a visible recharge of when your next sword swing is available
Overall:
Lots of fun, lots of polish make this an amazing entry! The boss fight when he starts getting his own hearts and it DOESN'T seem to stop- that was terrifying at first! But I was able to avenge my father! What a neat little experience!