The Version 6.0 Beta just got an update.

I am tweaking the way life can form on planets.

Vapor Worlds

Previously, planets with a vaporized atmosphere, i.e. no surface liquid, could randomly have life on them. This is mostly still the case, but it is not quite as random. These planets will only have a chance for life if the temperature is not much higher than the boiling point of the surface liquid.

Floaters

Floaters were originally going to be life forms that were completely independent of normal factors like having an atmosphere, temperature etc... This is still the case. However, floaters will now always appear on planets with other life.

Smoke Beasts

Not to be confused with floaters(!). Smoke beasts look a bit like floating clouds, but they tend to behave more like the animal style alien creatures. Well, these guys just got a bunch of new, random attributes. These don't contribute a whole lot in terms of gameplay, but they will appear in a much wider variety of colors and forms. I am excited to see your screenshots as you encounter some of these, as I am not sure I can predict all the various possibilities.