I'm overwhelmed by people telling me their GOTYs - and a certain titles keep cropping-up which, whilst I can see why people like them, I think require a bit of night-blindness to really love.
My starters for 10 - you can argue them down, add your own or just blow your lips whilst rubbing your finger against them if you like :)
A weak start this one, perhaps, because my only real criticism of it is that it's technically shoddy in a way few PC games are these days. Since launch I've yet to manage to play it for more than 15 mins before it crashes - I've even uninstalled it and added it to the 'might work on the next machine I buy' pile!! It appears to be lovely, outside of that slight issue tho :)
Oh how I love the concept - love the surface simplicity but hidden complexity too - but it's a mean-spiritted sonofabitch and after a while you start to think the developers were more interested in seeing how much frustration they could pour onto their players, instead of how much entertainment...
Legend of Grimrock
See FTL but without the hidden complexity ;)