Gunpoint is a game about one man and some extremely poorly designed electrical systems. You are super-sarcastic freelance spy Richard Conway, your client just got killed, and you were caught by security cameras at the scene. You have to clear your name, deal with scads of corporate espionage, and try to find the real killer.
The game is, as the website says, a puzzle-stealth game. Everything in the buildings you're infiltrating is hooked up to one of a few electrical grids. You can rewire them to, say, make a lightswitch open a door. You have to use this and some other tools to clear a path to the objective (usually a computer you're hacking into) and avoid or take out the guards.
It only takes an hour or two to run through it, but I'd at least double that after a replay or two (it has a branching plot).
It's really fun and quite hilarious, and it's only $9 at the moment, so there's no real reason not to pick it up unless you are Scrooge McGrinch.