So far so good on making a Stealth Game. You can hug walls with the Space bar and crawl under yellow blocks with Shift.

I have no idea what exactly the character is supposed to be at this point. I am thinking an escaped bioweapon, possibly a blob of some description rather than a criminal since escaping convicts tend to look a little too sympathetic (Go watch Oh Brother Where Art Thou). Now that all the basics work, its time to pretty it up!