Space Engineers is a sandbox game about engineering, construction and maintenance of space works. Players build space ships and space stations of various sizes and utilization (civil and military), pilot ships and perform asteroid mining.
Space Engineers is in alpha stage of development; core gameplay mechanics are mostly completed and, though its still far from complete, as Marek Rosa, the founder of Keen Software states, the video below shows a pretty full package already.
From what Marek Rosa states, Space Engineers takes the groundwork that Keen Software laid for Miner Wars and builds on it immensely.
“After finishing Miner Wars 2081, we could have proceeded with a sequel or an MMO, but we felt that first we need to focus on construction and sandbox mechanics, integrate them into our VRAGE engine, build a game that represents them in a best possible way – “Space Engineers” and then reuse them in our future games: a sequel to Miner Wars 2081, an MMO or something else.”