This is really cool and has a lot of potential. The dodge roll takes a little bit to get the hang of but feels really smooth once you've mastered it. I've never seen a game do claymation-style graphics before but it works oddly well here.
Grave Knight is such a well-designed boss, attack patterns are varied enough to be engaging and it feels really fun to fight. No negative feedback about this one, it's perfect already.
Nalani is a neat idea, but the windows between her attacks are too short to reliably hit her. I've found the only time I can consistently get an attack in without risking damage is by rolling to the side when she does her combo or sidestepping her dash attack. Which has the side effect of making her health bar feel too big.
Overall, very polished and impressive especially for a one-month project. Would love to see this become a full game!