I wasn't going to post here, but then last night I got Killing Floor off Steam

and I'm totally addicted.
It's basically very similar to L4D, except in this it really feels like the monsters are going to kill you. Like you die easy, you're much more vulnerable and you need your team to survive. Has a nice dynamic where you have to buy weapons and ammo between waves of enemies, which makes accuracy and general good-killingsmanship important. Top notch indy.
It's META SCORED at 71%. and Only £3.99 on steam right now. Worth a Look.
Oh oh oh , and before I forget,
this is a point and clicker like Machinarium mentioned above but it's an ABSOLUTE JOY. THe graphics are so clean and unique (screenshot not doing it justice), and they gameplay is massively satisfying, and unlike alot of Point and click games, it's
intuitive, you're not just clicking around the screen trying to find the next thing to click.
Me and may girlfriend played it from start to finish in one sitting over christmas.
I want robotic legs.