To connect wires, you need :

• Click on the wire
  
• Click on the pin where the screw is

DO NOT click on the screw. Don't try to pull the wire, it will not work.
The tutorial doesn't explain it correctly.

The game is lacking of pipes. I suggest to buy every pipes you see. Especially Pipe 40cm r10, it cost almost nothing and it's expensive to repair them.

You play in expert and the mission doesn't say "accomplished" ?

Your valves are not open at 100%.

There is a way to work it around :

• Change difficulties to normal
  
• Follow the step tell by the game
  
• Do that until the game to tell you to screw the panel
  
• Change difficulties to expert
  
• Close/assemble everything (last screws on the panel)
  
• Complete the mission

So, you finished all the available missions and you don't have money anymore ?

To save money, i suggest to unlock more mission, i suggest to unlock Skills training first (Maintenance, Electronics, Diagnostics, ...). Unlock Flight Training only when you have nothing else to unlock, it will save you a lot of time. Don't unlock print stuff at the beginning, wait to have a decent amount of money.

If you are really struggling with money, the only way is to redo past mission you already done.

• Go in the "missions" tab
  
• Click "completed"

You will see a lot of mission you already did. You can play them again to earn money.

In this game, there is stuff you can't remove.

Example :

• You can unscrew a panel but you can't remove the panel
  
• You can unscrew the fastening of a pipe but you can't remove the pipe
  
• You can unscrew the screws of a fastening but you can't remove the fastening

If it happen to you, it's not a bug.

It just mean than this area of the satellite/device is not part of the mission so don't waste your time on it. Search elsewhere.

Example of situation like that :

• A satellite around the moon where there is a panel who can't be unscrew.
  
• A sateliite around the earth where there is long pipe who can't be remove.