My first idea for the jam was a 2D top-down space exploration game, where you can upgrade and modify your spaceship. But I think there will be a lot of games like this, so I came up with another idea and I think it is even better. The basic concept is much like Banished, but obviously in space ;-)
You start with a small space station and a few people. You have to mine resources, like metal and hydrogen from asteroids and/or planets. With those resources, you will be able to expand your space station.
The first name coming to my mind was "Space Colony", but there is already a game with that name (from 2003). So I have to find another name. After a few moments I came up with a new name: Solar Colony
Maybe not the best name, but it will do^^