Demo version 1.03 has just released. Eager for your feedback on this early implementation of Rockling seniority: performing tasks now increases a Rockling's personal experience level which leads them to traverse more quickly and perform tasks more efficiently.
Full changelog:

• Added Rockling level-up system represented by battery backpacks
  
• Update to some 3D models
  
• Minor changes to tutorial (bigger work is still on the to-do list)
  
• Under-the-hood code improvements that hopefully fixed some bugs

Demo version 1.02 has just released.
Changelist:

• Attach increased (but not absolute) priority to jobs explicitly given by the player
  
• Prioritize giving jobs to suitable available vehicles in favor of idle Rocklings
  
• Tweak depth-of-field intensity
  
• Prevent automatic reinforcement job when drill/dynamite order is given
  
• Under-the-hood code optimization