Kerbal space program is a simulation game where you are creating your own rockets to advance the space program of an alien race called Kerbans to get them to reach the stars.
Their are a couple of ways to play the game where you can do One either Going into sandbox mode and just messing around seeing what you can make for example you can recreate a star destroyer from star wars or making a giant mech from pacific rim.
Or you can enter career mode where you run a space program have funds to manage, research to do in order to unlock better rocket parts and being able to send your people deeper into the solar system. At the begging of the game the learning curve is a bit high as you have no idea what to do as the game is a little complex but it does offer a tutorial for one to use to learn the game a bit better but I say the game gets the most fun when your launching satellites into space and landing on other planets as you spent hours making small progress from making a rocket just go up to conquering the galaxy
Now you cant really beat the game as their is always things to do but if your feeling board of the base game you can mod the game and its pretty simple but with modding you can add so much more content into the game like being able to go to other solar system like Alpha Centauri and explore the planets their and set up a colony of Kerbins.
Kerbal space program is 40$ on steam which is pretty expensive but it does go on sale often and I would recommend getting it then as it is a complex game to get right but its loads of fun to play if you like being creative but smart with creating things I would give the game a 9/10 as most of the negative aspect of the game can be fixed either with mods or learning the game and becoming better at it.