I bought more than 50 games since December 2011, not counting those from last December because I'll play them in 2013. But some of them were part of bundles and I don't want to play them, so it's roundabout 30-35 games for 2012.
My favourites:
Binding of Isaac: I bought this in April for 2 Euros on Steam, but played it for like 40 Euros, almost a full month. So intense, and I wanted to get all items, beat the final boss etc.
But, as all rogue-like ones, at some point the fun is over immediately, and I did not start it again another time.
Faster Than Light: A space-strategy game, where you manage your own ship, micromanagement at its best. This was also really fun for three or four weeks. I did not enable every ship, since – just like Binding of Isaac – the fun ran out, since you play a game for 2–4 hours, than another one the other day etc. But it was worth the money, and this is one of the few games I bought at release day.
Defense Grid: The Awakening: When I say tower defense, you think of Flash games, funny for two hours? Wrong. This is a tower defense game that binds you for many hours. It has superb graphics, is sufficiently balanced and has a nice story behind the missions. Also there are several game modes, for more challanges. It was very fun.
I know, two of three are not from 2012, but as I said, I almost never buy at release day, and many games don't age.
