Drone building

This is probably the main part of the game and it is already great fun. I have some minor problems that might need an improvement.

Fuel and Energy are not really optional I allays take small tanks and solar/small batteries because the bigger versions have too less use. My suggestion is to remove the "recharge" and split it in container and producer. For example solar panels produce energy and batteries can hold it.

Drones can become wobbly and this is a problem of many (physic) building games. My first idea to solve this problem is a structure layer. A background layer that become a single element and hold other elements that are build on top, so they don't need there own physic calculations every time only when the "group" change.

The automation section is also a very promising part of the game, this is already very solid and works great with "keys" an alternative idea would be connections so it would be visually understandable but keys are fine. More stuff would be great.

• Signal: this would be useful for the directional sensor as third option beside gravity and mouse.
  
• Sonar: give the distance to the nearest enemy/signal, the simple one can just have 2-3 step range area where they press a key or more complected they send a signal on key press and the player have to measure the ping time.
  
• Directional speed meter: only detect speed in one direction. Or maybe acceleration instead of speed?
  
• Multiple inputs and/or named variables: "If a then b" is maybe too simple more often you want more then one condition sure you can do it with and/or gates but at the end the available keys can run out (I guess no one has done it yet)
  
• Analog signals: nice to have but not the most important but it would give "if a<x then b" more power or control the changeable truster better
  
• CPU (have no proper name): The most important usage would be to simulate the mouse and give relative coordinates for targeting or sensors (would probably require analog signals)
  
• Constants: with analog signals there would be a need for constants as well