11. Kerbal Space Program
Units Sold: 1.5 million
Metacritic Score: 79.67
In Kerbal Space Program, you are tasked with your own space program, hoping to create your own spacecraft that can fly into space without killing its crew. You are given various parts which you have to assemble to create a ship. There are numerous things to discover in the game both in building your ship, and exploring space. The game also offers various game modes, such as Career mode which you are given missions to complete.