Kerbal Space Program

Kerbal Space Program is currently one of the free games through Amazon Prime with GOG, until Dec 18th

Manage your own space program and help the Kerbals conquer space.

https://gaming.amazon.com/kerbal-space-program-gog/dp/amzn1.pg.item.86a1a1cd-19c4-40d8-9f13-abeb3ed8b54c?ingress=amzn