We just released UpvoidMiner 0.4.70!
We are still not done with the major changes in the engine core, so there are still many bugs and crashes left in the game. However, we implemented some gameplay features to UpvoidMiner. The terrain contains flat valleys and a desert biome now, and you can chop trees with your axe. You will have to delete your savegames folder in Engine/Savegames after updating.