This feels much more satisfying and well-tuned than the original Sanctum - and the addition of co-op takes it to a whole new difficulty level.

Deus Ex: Human Revolution - Director's Cut [Steam store page]
While the story is weaker than the original, this FPS-RPG still offers many viable playstyles - and a visually stunning world. And the Director's Cut does a slightly better job of integrating the DLC, although they're still sort of an independent experience.

You also get a few other perks like developer commentaries, although these don't have any visual indicators to show where they are, so they're hard to locate and activate as you're playing. The redesigned boss fights are a nice touch though, and definitely a welcome change compared to the originals.

Defense Grid: The Awakening [Steam store page]
A carefully balanced tower defense game with excellent voice acting that weaves an interesting story throughout the campaign.

It looks nice and is enjoyable, but could use some tweaks especially at the more advanced levels. A bunch of enemies in a row can tag team your resources quickly down the line from quite a distance away - which feels a bit cheap at times, especially since the resources travel much faster when rubber-banding to an enemy unit.

It also would be nice to have more control over tower targeting priority, or even just a manual targeting mode. For example, in the later levels you want guns to tear the shields off targets before the lasers attack them - but the guns stay focused on a target until it is completely dead even if they aren't doing effective damage.

It's still one of the better TD games out there though, excellent polish and balance.

Dead Space 2 [Steam store page]
Much better and scarier than Dead Space, good atmosphere. The camera isn't sluggish and not as close. Combat also seems more responsive, and melee is somewhat possible. The 'Force' is useful, though sometimes the item you're holding disappears.

An interesting blend of FPS and tower defense. Seems geared toward multiplayer, and probably fun in that aspect. Novel controls - easy once they're familiar. Flaw with anti-aircraft guns - they all shoot at the same target, needs better AI for that.

Extremely inaccurate guns - worse than Counter Strike: Source - which makes it nearly impossible to kill anything at range without several clips of ammo. At close range it takes 2-3 head-shots from 4ft away, which is ridiculously bad. Decent story though.

This feels like a console game - smoothed movement, unchangable (close up) third person perspective. The combat is also poor and frustrating - with guns that seem like they were meant to be used with auto-aim. Melee combat is completely useless.