I can only imagine the skill that went into this. A whole lot of systems working together and creating something (to my knowledge) unique.
By it's nature this is a complex game to control. I have to admit I found it a little overwhelming and found the symbols hard to keep track of. Maybe pressing and holding both keys could pop up the ref sheet?
Incredible work though, I never would have guessed something like this could work with two buttons. Huge points for including a true tutorial, for a working AI and for including a Wilhelm scream.