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definitely magicka if you don't already own it.

I got like 15,40€ but I'm waiting for good sale, I suggest you too.

Steam summer sale coming. Be patient my friend :D

Half-Life: Opposing Force maybe? If you like that sort of games...

This, even better if you wait for a sale. Buying from Playism is still cheaper, though.

Chivalry medieval warfare + dlc

26 copies of Real Horror Stories, 27 if you can get 4 more cents. I've already given away 5 copies on SG and given a few copies to friends. Clearly the best $2 I've spent in a while. :)

Meltdown

bad rats

Sonic. You can have a lot of fun playing it with friends (local or online)

I would wait for La-Mulana to be on sale (If I didn't own it already).