I played s.p.l.i.t fairly recently, and I was seriously impressed. It's a very unique narrative-driven game where you're in communication with a small group of hackers in a uniquely dystopian world, and you need to collaborate with them to hack a specific device.

It's only about an hour or two long, but it's priced to match at $3, and wow did it leave an impression on me, it's unlike anything else I've ever played.

Highly recommend it if sounds at all intriguing. Knowing some basic MS-DOS/Linux terminal commands beforehand, like how to change directories/navigate would be helpful (this quick guide would be all you really need).