i dont understand how to do the slash thing

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A mysterious warrior named Ichirou possesses the legendary forbidden sword. Tho the sword grants godly powers, it drinks the blood out of it's enemies and it's wielder. To satisfy the sword's thirst, you must slay ninjas that disturbed your deep stasis and discover the mystery that stirred them affray.
Version 1.0.9:
- Fixed some bugs of player not rolling.
- You can now pick space as your attack instead of the mouse. Pause the game for this option.
- Evasion reworked. Evasion works without interruption your combos and you will now only able to activate the teleport skill if threatened by unavoidable attacks.
- Non-charged brandish arts are now on shortcut keys! Rising Moon Slash can be used by simply pressing [2] or [X] now. See ingame for shortcut keys.
- Particles can be disabled in game. Pause for the option to do so.
- Ichirou is now much more agile! You can jump anytime even mid combo or to break vulnerable animation frames.
- Musashi's Rage reworked. Now you will have use for those souls.
- New endless mode added! Finish the game to access the stage. Much harder than the first endless mode.
Thank you for your valuable feedback!
i dont understand how to do the slash thing
It's definitely a fresh take on the story of ninja brothers and all that. Complementary music, easy controls, excellent character design and background design, and very addicting.
However a good number of medals aren't working when I achieve them and the game has severe lag when more enemies show up.
i messed up so bad i broke the game
can't seem to save it though, it sucks to play it again after you completed everything and all
THE MOUSE ISNT SHOWING UP ON THE GAME MENUS WTF GREAT GAME THO BUT FIX THIS PLEASE