This explained quite a bit more. If I may summarize it for you:
- Collect coal in the sand level, to feed to the Generators(4) to create flowers which sell, earning you dollars.
- Upgrade Generators(4) to create better flowers, which sell for more.
- Collect Iron from the cave level (entrance Right-Bottom), to feed to a Generator(4) which creates an iron bar?
- Use Conveyer Belts (2) to feed iron bars to a Compressor(1), or build a Compressor(1) directly next to a Generator(4).
- A Compressor will create a highly worth flower to sell to a 'sellbox(3)' ?
- You can upgrade flower field with dollars!
The numbers next to buildings indicate their position on the right bottom of the UI.