Krater was a breath of fresh air, delivering a fun and approachable post-apocalyptic RPG stuffed with humour and colour. It's the good (and rarest) kind of comedy game: one that strives to be a successful game first, then works around the strong mechanics with some anarchic gags. Fatshark are still patching it like crazy (almost all of the launch issues have completely gone)... and if the co-op patch works, our score will be moderated up to an 8. Might be worth getting in beforehand at this price.
Alternatively, the collector's edition will run you £7.50.