I've been looking for a two player game I can co-op with my girlfriend and can't seem to settle on anything we both feel good about. I was thinking Insanely Twisted Shadow Planet would probably work well, but any recommendations would be welcome! Basically, we're looking for something we can both play, and equally (not asynchronous), in a co-operative format. Preferably with controllers?

Thanks!

EDIT: Nothing against Borderlands 2, by the way. We've just already played a lot of that and loved it.

Castle Crashers, Renegade Ops, Dungeon Defenders, Magicka, Monaco, Rayman Origins/Legends The Cave, Lara Croft and the Guardian of Light, Sacred Citadel. That's about all I can think of on my steam library. My wife and I have had many hours of fun with these on the couch with controllers in hand :D

Guacamelee!

Pretty much all of kipperminge's recommendations are great too. Monaco in particular was great fun in co-op

I know it's not technically a couch co-op game but I've had a lot of fun playing Dark Souls in a couch co-op setting. When one person dies they hand the controller off to the next person. The person not playing can be looking stuff up or watching for hidden paths or loot, looking at enemy attack patterns for different strategies, ect.

Serious Sam 3 is tons of fun in split-screen, Trine 1\2. And I'll second Renegade Ops, Guacamelee and Rayman Origins\Legends. Also apparently Painkiller Hell and Damnation has split-screen. Though not sure, haven't played it yet, but if it is at least somewhat like the original then go for it.

Well, the Lego games are pretty great in co-op, also the new Rayman games. I'd say Magicka, but the spells are a bit annoying with a controller imo. Awesomenauts isn't co-op per-se, but you can do splitscreen and it's pretty fun.

Native (Steam):

http://www.co-optimus.com/system/4/pc.html

May help

Risk of Rain has 2 controllers couch co-op (thought for some stupid reason you have to use the mouse to navigate the menus before entering the game). Hell of a great bonding experience IMO! And it's pretty cheap IIRC.

If you search for "local co-op" in the Steam store you will get a list of every game that supports local co-op. And once you've done that you can narrow it down by price, review scores, etc.

Are there any games on Steam that support dual monitors so each person could have their own screen?
Playing with a monitor and a TV would be pretty neat.

didn't know blands2 pc had local coop

Spelunky is always good fun. If you're looking to destroy your relationship, I'd recommend Nidhogg or Samurai Gun.