Rock, Paper, Shotgun pointed me in the direction of this free little game. Fathom is, quite simply, the best such game I’ve played for a long time, but not for the gameplay. There’s a twist in the game which, I’m relatively proud to say, I actually got. I’ll not say much more so as not to spoil it for you, you can find it here. It’s basically a platformer, but it’s well worth a look.