WASD or arrow keys to move, Mouse to aim the swords towards cursors (blue cursor is mirrored from red). You can slam the swords together, causing a wind blast, also moving you slightly, and you can throw your swords (towards the blue cursor) to dive (by clicking the red cursor).
A few sounds and gifs from the internet. I dont know the direct sources these originate from, but the slash sound when you jump forwards is from Undertale.