What is a good game for max. 5€ on Steam?

The Binding of Isaac

I recommend getting Super meat boy. it's 80% off right now :D it's epic

Get yourself Arx Fatalis dude, it's really good.

Breath of Death VII/Cthulhu Saves the World pack for 2€. I heard it's around 16 to 20 hours of gameplay for both together.

Nice Games but I already have them (my brother too) ^^

I would wait for the winter break matey.

yo could buy Fallout 1 & 2 from gog.com

Beyond Good & Evil

just wait for the holiday sale on steam.

Dark Forces, if you don't mind old games

The Binding of Isaac, Super Meat Boy (on sale ofc)

Penny Arcade 3 took me about 11 hours, and has great game mechanics along the SNES era RPG feel. Also had good some good music, and a crazy storyline, like everything Penny Arcade touches.

Obviously THE game you should take is Deus Ex though.

Wait for Christmas Sale.

Wait for Christmas Sale.

Cthulhu Saves The World

It's a very nice old school RPG and well worth the money ;)

Dungeons of Dredmor

Get Jet Set Radio, it's on sale right now dude. (for 3.75)

Well... unless you're using a Steam Wallet.