Gunpoint is a fabulous game that sets out to accomplish one thing and does it very cleanly.
Gunpoint is a 2d game, where you control a little dude who sneaks through buildings, kicking people off ledges, and it is very entertaining. Gunpoint is one of those games where you can look at one minute of game-play and understand the whole game; that is to say, there isn't much to it- However this is not a bad thing. While the game does not last for hundreds of hours, it sets out to do one thing and does it reeeeeeallly well. No fluff, no fetch quests, no BS. Just play it for 2-3 hours, and you've beat the game.
Where the game really shines is how clean and easy the controls are, as well as the steam workshop integration. This is a game where it can be considered partly action, but more so a puzzle game. There is potentially for really complex, well thought out levels that people can make and you can play for free.
There's not much more to say than that:
Overall, it's cheap, it's fun, it's nothing huge, but it is definitely worth the buy!