To increase the immersion and sense that this is my character and base and that these are my choices I'd like to see some distinct character types with different build options.
A choice of starting character, like Engineer or Biologist, could be introduced with their own distinct path of development and structure types.
E.g. Biologist - Animal drawn transport, slower but refuels on its own. Skills and traits that enhance survivability or provide immunity when encountering certain hazards. A distinct graphical style for the character, equipment and buildings that reflects the path.