Pony Island

Format: Windows, Mac, Linux (Steam)

Genre: Endless runner/Puzzle solving hybrid (yes, really)

Length: About 3 hours will see you through the storyline, but be prepared to sink in a few more hours to find easter eggs and a second ending

Publisher's Blurb: Pony Island is a suspense puzzle game in disguise. You are in limbo, trapped in a malevolent and malfunctioning arcade machine devised by the devil himself. 

The devil detests having his puzzles solved and poor programming exposed; you will need to think outside the box to proceed and you will be insulted when you do.

Games Like This: Portal shares a few similarities, being a puzzle-solving game with an antagonist that attempts to control your actions and talks to you throughout, but Pony Island really is very different to anything I've seen or played before.