Steam

Supraland, I 100%ed that and the dlc, I hadn't done that since Spyro 2 on the PlayStation.

The Vanishing of Ethan Carter also left a big impression on me. The ending keeps lingering in your mind. I think a lot people reach the end of the game without doing the side quests, when it turns out the side quests are what trigger the ending and the credits to roll. Just sit there in silence after the credits are done running kinda game.

Prodeus just kept on giving, also recommend. Doom on steroids.

Reflex Arena, which is the best arena shooter with classic feel. It also has that classic amount of players, which is none, which is a problem for a multiplayer game. Only recommend if you are a hardcore Quake fan and have friends, a rare combination.

Auralux is a very relaxing "RTS" reduced to the bare minimum. It's a great game. Many states of varying difficulty.

Most people would probably enjoy auralux and supraland the most. Especially auralux can be very soothing.