Good concept. The intro really helps get you interested in the story from the start. Using shift kept bringing up Sticky Keys. I did that in round 1, but with Control. Someone pointed out to me that Shift, Control, and Alt are really common hotkeys on Windows and should (typically) be avoided in game development. Unsure of who specifically told me that, but thought I'd pass that along. It helped me out.
The sound design was really nice. Wouldn't have thought of using different sounds for each surface. That was an awesome touch. Nice job.