Shadow Complex is excellent. It's not the longest game but at $15 there's no complaining. I've been playing Shadow Complex while also playing Super Metroid lately and it's been cool seeing all the similarities. There are so many. It's really just like they took Super Metroid and put it in a Metal Gear environment and added a little bit more stealth. I love both these games and now I'm addicted to Metroidvania. Next stop Castlevania Symphony of the Night, Metroid Fusion and Metroid Zero Mission.
I'm also still playing Mario & Luigi Superstar Saga still and still haven't opened Bowser's Inside Story! Little sprinkles of Scribblenauts, Oblivion, Dead Space, Metroid Prime 2 and Halo 3 here and there too. I'm kinda disappointed in Oblivion. I liked it a lot at first but I guess I screwed up my character cuz they suck and I couldn't close the first Oblivion gate. I started wandering around doing quests and joining guilds to get better, but I'm just not feeling a commitment to the game. Maybe I'll get into it eventually. I played the South Park demo on my 360 and it was pretty cool. Looks like fun if you've got enough people playing. It's got tons of fan service. I'm considering buying.
In fact I've got a ton of games I just have to have right now and I'm busy enough as it is with the ones I have
I've just gotta get:
Metroid Zero Mission
Metroid Fusion
Castlevania Symphony of the Night
Final Fantasy VI Advance
Batman Arkham Asylum
Psychonauts
South Park Let's Go Tower Defense Play
and I'm impatiently awaiting:
Brutal Legend
Dragon Age Origins
Metroid Other M
Pokemon Heart Gold/Soul Silver
Super Street Fighter IV
And then there's a plethora of other games that I badly want but don't quite make this VIP of games list
There's not enough time in the world. 
And now I've gotta do some homework..ugh
