LMB/Space to attack F to parry Q to dodge B for auto-aim, you weaklings......., (I shouldn't have to say this) WASD to move around Fullscreen is recommended
This is a very difficult game. If you want to play through its entirety then I hope you don't get deterred easily. (There's also this bug where if you die and try again, the fight won't actually start and it will just stop, press the flag again after this, but only after this, and it should be back to normal). Also there is plenty that I have indev rn but I stopped working on this since like a VERY long time ago. For now this is all you're getting. Good luck.
