When you have a game with only 1 person doing most of the work, It is going to take a long time for anything to get finished , especially if the developer is working on 10 things at once .
There are several new games that have popped up on steam that are rapidly becoming similar to this . Especially the planets addition to space engineers . Both Metaverse and empyrion are also very close to this in a lot of ways and different in others . Also a new game called Kingdoms was just released on steam. So while we are waiting, there are others to check out . I do not want to leave out Space engine. If they ever do biomes and building on the billions of worlds it can create, it will be great. There is plenty to do. And seriously , I doubt we will see biomes anytime soon. At least for 1-3 months. So check out what else is out there while you are waiting. Rising world's biomes will be done when it is done.