Transport Tycoon was fantastic and thanks to OpenTTD I still play it from time to time.

Gothic 2 is by far the best Action RPG of all time. Witcher 3 comes close, but still fails to surpass it in so many places.

Banished always gets me with it’s atmosphere. It feels cozy but at the same time you are close to complete annihilation. Oxygen not included hits the same mark, but also has a distinctive art style and humor to it which I love.