i've only played freeware ones so i can't comment on Bastion or Minecraft or Terraria or Four Winds Fantasy
even tho i contributed to it i really liked the IGF Pirate Kart which was basically just a giant (1.4gb or something) compilation of short goofy games with a loader stuck in that got submitted to the Indie Games Fest. lots of 2hour klik n play games, lots of jokey stuff and terrible ideas and cool ideas (turn-based pong was a favourite) (also Shit Snake) and repurposed default art and ideas. flicking from one strange fragment and seeing what was going on with each one and how they commented on / mocked / contradicted / expanded on each other was probably the most fun i've had playing a videogame in the last two years or so!! website is
artgam.es.
otherwise i really liked Bat Castle and Bonkey Trek. i'm sure there are others but they slip my mind at the moment!