I just want to point out that the Binding of Isaac is on offer for £0.99!
This is a superb rogue-like game with keys, chests, bombs and manic action.
Can't recommend this highly enough. One of the best little games I've played in a while and very very fun.
A pound (so probably going for 1 Euro?) is so cheap I'd have to challenge you to give me a reason why you wouldn't get this game...
http://store.steampowered.com/app/11...snr=1_4_4__sfs