Awesome game! I finally beat all 3 levels. It's extremely hard though lol.
Enemies have like no attack cooldown nor do they get stunned so pretty much the only time you can hit them is if you successfully parry. But even if you parry, you have to immediately attack (like the 2nd level, if you're just a bit late after parrying, the guy hits you just as you're about to finish your attack animation).
Another thing is that the enemies all have weapons that are just a bit longer than your sword. Which means you have to be within their attack range to hurt them and that means you must parry.
You also get stunned when you get hit but the enemies do not. You like never get a chance to do a double attack hit.
Also, to be honest, the dash ability pretty much doesn't make the game easier at all lol. It's like only useful in the first level where the guy charges you. Once you parry his charge, I guess you could use the dash to catch up to him since he almost always overshoots past you and he'll keep charging till you get close enough.
You've made an extremely hard game - harder than Sekiro lol. Your timing must be very on point and there's practically no "free" hits on the enemies. But with enough patience and practice, people can get through. And those who do, are rewarded with a sense of achievement on this difficult game.
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If you want to make it easier (like an easier mode or something), add in attack cooldown on enemies so on certain attacks or something so you can get in free hits.
Another is to add enemy stun.
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As for suggestions to the actual game and not difficulty, you could add a health bar for the boss so we can see how much more we need to fight before he dies.
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But yeah, awesome game! Good job!