An RNG-based horror survival game with very compelling gameplay mechanics.
The aim? To survive for as long as you can. There's also a campaign mode which you can 'discover' during your time in the Sandbox.
Highly customisable settings so you can play the way you want to play (as easy or as hard as you want), with a big range of unlockable characters who possess different strengths and weaknesses.
Recently updated with Steam Workshop functionality, which means the game now allows for user modification to alter and optimise how you want to play the game.
Resources
Don't Starve Wiki
Steam Workshop
Please note: Whilst this game is also on sale on Steam, I have opted to list only the Humble Store's URL link as it should work out to be the same price, but the developers (Klei Entertainment) receive a higher cut, in addition to the fact that you get a Steam key + DRM free copy of the game.
Great game and a good price. I paid full price and it's worth every cent.