Always upgrade the planet with the lowest ROI (seconds).
As you progress, raw ore sales become secondary to high-value items like or Subspace Relays . idle planet miner spreadsheet
These games rely on a traditional simulation game loop, similar to compulsion loops you felt in games like Sim City (the original) Mobile Free to Play·GDC Festival of Gaming Always upgrade the planet with the lowest ROI (seconds)
While the Mastersheet is a powerhouse, your strategy should shift as you progress: idle planet miner spreadsheet