The game dev's are working very, very hard on this game. And with a staff of only around 10 people, it's going to take some time to dream up some new features, code it in the game, and upload it on the servers. Especially when there is a big, game changing feature implemented (0.18 the new era (that was a biggie) , 0.19, rovers, 0.22, career mode with science experiments (that was also a biggie) and 0.23, with a lot of work on the career mode aspect on the game). I will be nice and tell you this, just enjoy the game as it is, let the updates roll out as fast as they want to, but other than that, just play the actual, current version of the game.