Basics: Arrow Keys/WASD to move. Space key to attack. Other: Play button with 'L' to load a level code. Q+S keys to save a game code. Scroll on the help page (use the ? button to get there) to read up and down. M key to toggle music and mute. X key to close out of save code menu. Other help is on the help page.
Thanks to @qucchia for how to detect scrolling. If you want to try the level loader, here's a sample level code: /<,.>?gkde{}{&[#+\jgverd/i/.wexks<z}:+|(h)+:
