My main question was what else he still wants to get done. Are there any more big things to get done, or is it mostly optimizing and bug fixes at this point? Or is there not a specific road map, and kind of just getting done what he thinks he can for now?
There's a lot of things to get done. The volumetric nebula, the new planet classification system, new detailed textures, optimizations, etc. Significant work has been done, but that's up to Space Engineer to decide when enough is enough. I personally like how he keeps adding more to this update, even if it prolongs it.