Fun concept. Typically a clicker-style game needs some sort of automation otherwise after 1000 clicks with no end in sight, most players will move on. Thinking about some more gameplay that would keep me engaged longer:
- Automation: Jackhammer acts as mouse click wherever cursor is, upgradable to faster clicks
- Automation: Moles to randomly dig plots
- Automation: Dogs to retrieve the materials
- Shop to sell materials
- Market to trade materials
- Goals/Achievements- Lots of options here. Maybe end goal of digging to the center of the earth?