Sixside is a nice first person free-running platform game, similar to Mirrors Edge, but with Tron style visuals, and MUCH harder.

Players use a combination of wall jumps and platforming skills to traverse the levels as fast as they can while trying to not plummet to their death (which they will).  The difficulty is reminiscent of Super Meat Boy, and similarly to SMB, there’s a great satisfaction to be had from pulling off a perfect run and making it to the end of a  level.

Download the Beta HERE