Dr. Langeskov, The Tiger and The Terribly Cursed Emerald: A Whirlwind Heist

It's free, so you may as well give it a go if you have half an hour or so free. Also, it's not GaaS, so it gets brownie points on that front.

Most recommended little weird thing. Had forgotten I played it and loved it. Great ending!

Do you like The Stanley Parable? Or perhaps mindblowing things and whatnot? You come to the right place, pal. 

You can also download it from https://crowscrowscrows.itch.io/dr-langeskov-the-tiger-and-the-terribly-cursed-emerald-a-whirlwind-heist 

without the steam client if you are so inclined, but then of course you have no achievements.

A short and very silly/quirky game in the same vein as The Stanley Parable. It's free and Justin Roiland did some funny voice acting parts for it.