With mouse only.

    BUILD
   
You can build the following:

• Gatherers: extract resources from the ground
• Combiners: combine two resources into another one
  
• Producers: produce energy
  
• Capacitors: stock energy and resources
  
• Connectors: connect buildings
  
• Transmitter: sends energy to the earth (don't forget to connect it to the energy network)
  
• Headquarter: you need to level up this building to unlock researches
  

   
Almost every building needs to be connected.
You can upgrade a building with the "Upgrade" button.
You may cancel an action (e.g. placing a building or upgrading) by right clicking.

    RESEARCH

You can do some research to improve your buildings or unlock new ones.
New buildings give access to a new kind of resource.
You have to upgrade the headquarter to access other buildings' upgrade levels.

    CONTRACT

You can earn credits by fulfiling contracts.
On the "Contracts" page, you can select a contract you want to accomplish.
You cannot change the current contract unless you complete it.
To complete a contract, you need to send a certain amount or energy to the town specified in the contract (see "EARTH/SEND ENERGY" section).

    EARTH/SEND ERNERGY
   
The main goal of the game is to send energy to Earth.
Towns are connected only on certains hours. So if you want to send energy to a specific town, you have to wait for the town to be available.
To transmit energy, you have to connect your transmitter to a working energy network.
Toggle the "Start sending/Stop sending" button to enable energy transfer. Don't forget to disable the transfer when you're done.
Energy can only sent from your batteries.