JiG writes: "The game is played with either the [WASD] or [arrow] keys for movement - whichever you prefer. The meat of the mechanics, however, lies in the all-powerful [space bar]. Tapping it once is a "quick attack", a brief, weak sword slice. Hold down the bar and you'll execute a more powerful strike. And that's just the beginning. You can pause the game at any time by hitting [P] and read the encyclopedia with [E], which explains in detail how to execute all the moves. It's something you'll usually end up falling back on, since the in-game instructions are visual aides and are often maddeningly vague."
