The game is quite fun. I like the Japanese theme mixed with Hotline Miami gameplay, and the game really delivers that fast-paced action that it entails. The gameplay is simple yet effective, and it feels nice to fight through a bunch of enemies. The parry mechanic is also quite nicely done. It's somewhat a bit easy to use, and it's so satisfying performing one. This will certainly give us a bunch of power fantasy, and that's not a bad thing. I also want to praise the details in the map itself, and it really tells a story via the environment alone. Well done!
For a small criticism, I'd say later in the level design, it relies quite a lot on off-screen archers, which I felt a bit unfair and leads to some cheap deaths. Not a big fan of that and would suggest some type of scouting ability to offset that. I would also suggest adding some visual effects for successful hits on the enemies. It's always nice to give the players some visual feedback on actions they performed as intended, which is a subtle way to teach the player the correct action without explicitly telling them.
Anyway, this is a surprisingly well-done game! You should be proud of yourselves.