Like others have said the controls were very slippery and the melee attack had too little range to be useful. Parrying also really needs an animation. What animations were there were amazing, as was the music, though the sound effects on the player were maybe a bit... much.
Enemies had hitboxes that didn't seem to line up with their sprites at all, which might've contributed to the melee attack feeling useless since getting in range to use it was a complete gamble. Aside from that the only issue I had that others haven't mentioned is that the load times were a bit long for how short the rooms are and the lack of any visuals for the room transition made it so the game just froze during these loads.
This could be fun with some polish but it just wasn't much fun for me in its current state.