With the arrival of the Summer Steam Sale, which titles would you recommend? (Preferably titles on sale/you got on the sale, but anything on Steam goes, really)
I very highly recommend The Stanley Parable. It's hilarious, and when you pay attention to it it's also the smartest game I've played. It's delighfully self aware and has some great fridge horror.
As for pleasant surprises, I bought Wings of Vi on the sale and so far it's, as promised, hard as nails and incredibly fun. Ziggurat's also pretty nice.
I'll stop there because I don't want to end up recommending all of my library :p