Translated from the readme. I also included what the keyboard keys are. I'm unsure if they can be changed.
Operation explanation
Above ... attacking diagonally up by attack while pushing up in a standing state.
Under ... ... squat down. Pushing the attack with a crouching state sliding.
Left ... move left.
Move right ... right.
Button 1 (SFC type is A) · · · jump [Z]
Button 2 (SFC type is B) ... attack [X]
Button 3 (SFC type is X) · · · using cloud weapon [Space]
Button 4 (SFC type is Y) · · · Cloud weapon switching [Enter]
Drop strike by attack while pushing down while jumping.
Pause
Pause with ctrl + p.