It's also available elsewhere, but I really wanted it on there.
World of Goo is a game that would probably resent being dropped into some genre bin, but puzzle will do as a general idea, except that you complete these puzzles by building moist structures out of delicious living slime. It is perpetually clever, and you will feel smart while you play it. RPS and Eurogamer both have delivered jubilant verdicts. In a year of such amazing promise, much of it still in the form of potential, this is something stunning that you can have right this instant.
(CW)TB