I went a bit crazy with the Steam sale and ended up buying 6 games:
Child of Light
BattleBlock Theater (Ultra Baby's Co-op Chaos Pack)
Ori and the Blind Forest
The Stanley Parable
Tomb Raider I and II
On top of the games I also bought Sony Movie Studio 13 Platinum and soundtracks to Ori and the Blind Forest and To the Moon.
I'm still thinking of maybe buying a few games like FFIV bundle, Papers, Please, Don't Starve and the first episode of Life is Strange. I was almost going to buy Civ IV before I decided that I don't need it right now. Also was quite tempted to buy pretty much every Tomb Raider game before I started to think that I might prefere playing them on Playstation rather than on PC, so I ended up buying just the first too and decided to try them first before buying them all.
Steam sales are the devil when you're supposed to be saving money. Luckily it's safe to say that at least some games are going to be on sale again in 6 months time so it's not the end of the world if I don't buy them this time.