In a blogpost, Auroch Digital (the people who make Mars Horizon) announced the availability of an improved demo from October 7th until October 13th in the Steam Game Festival, Autumn Edition.
In Mars Horizon you run your own space agency, competing against other agencies to be the best agency out there.
I looked at it earlier and was quite pleased with it back then. The demo has been improved upon, using the feedback earlier demo players have provided. I am very curious where the game stands now!