I don’t think just saying "zero-gravity" does the concept justice.  It adds an element to the game that made me feel like a complete noob.  I felt like that one guy - you know the guy- who runs into walls...and keeps running.  Not only can you move forward/back, strafe and turn left/right, but you can also rotate around an imaginary axis emitting from your chest (think of doing a cartwheel).  This, along with the force of inertia sans gravity, made me feel like a fish out of water.  Yet, I loved every minute.

I know what some of you old-school gamers are saying: "Isn’t this just Descent without the ship?  I was a fan of that game, but I can say without reservation, Shattered Horizon is very different and every bit better.
Created by the hardware benchmarking gurus at Futuremark, the game looks every bit as beautiful as the graphics tests in their 3DMark tools.  But beauty comes at a price.  The minimum requirements call for a Core 2 Duo E6600, a GeForce 8800GT with 256MB, and 2GB of RAM, and the recommended are even heftier, demanding a Core 2 Quad and GeForce GTX 260.  (That being said, I was able to play on a system with a Pentium 4 3.2GHz, 4GB RAM, and a GeForce 8600GTS, and aside from the occasional stutter, it played surprisingly well.)  Additionally, because the game requires DirectX 10, Windows XP users, need not apply; only Vista and 7 are accepted here.  Lastly, you’ll need Valve’s Steam client to download and play.

The controls are fairly basic: your standard FPS affair.  An obvious addition: the rolls horizon function allows you to roll left or right by holding the right mouse button.  The ’F’ key allows users to "jump to a surface", in essence attaching to any surface and walk along it.  While a much slower method of travel, it offers a level of stability when firing not otherwise seen.  Up and down are defined to the Left Shift and Space bar, respectively.  Of course these are configurable, thankfully, as the default key mapping isn’t very conducive to the way I play.  Once I made a few minor tweaks, and mapped the keys on my Belkin Nostromo, I was off and running.