Part of the Second Experimental Gameplay Competition entries held recently, String Theory is a game that can be played with either a dance pad (if you happen to own one and have it connected to the PC) or the keyboard (for us poor folks).
The objective is to keep the spider-like creature within the screen, using extendable feet to grab hold of any surface it touches. Limb can be directed by using either the mat or the numeric keypad, though elasticity and grip are lost quickly so it’s vital to keep the entity moving at all times.
Text files can be edited for an easier difficulty or just to modify screen resolution settings. An updated version is available on the same page as well, plus a sequel has been planned for release later this year.