Attempt to give you necessary information without spoiling anything.

You and 3 buddies are employed by the company. Your task is to collect as much scrap as possible from your destination. You have a quota to reach, shown above your main spaceship controls. You will be limited by time, shown on the monitor to the right of the quota.

Below the 4 monitors you have the main controls for the spaceship. You can land the ship and go to space with the lever. Next to the monitor there is a button to switch between what person its showing. With this you can see different objects on the map which can have special actions.

On the spaceship there’s also a terminal you can use to:

• Buy equipment
  
• Change the current destination / moon
  
• Read about creatures you’ve encountered
  
• Write commands

You can start by typing HELP into the terminal.

Equipment has different uses that you will find out by typing

INFO [Equipment Name]

You can order several items by writing

[Equipment Name] x[amount]

Into the terminal.
You can also shorten the equipment name instead of writing the whole name. At the start you have 60 credits to spend. Credits are earned by selling scrap at the company headquarters.

You can invite friends or have people join the lobby before you land the spaceship. After that you must quit to the menu to allow more people to join. The game saves every time you are up in space. There’s proximity voice chat and I recommend using it for the best communication and experience. You’ll want to hear your friends scream in terror and laugh when you’re dead.

For the controls you can crouch, sprint, drop stuff and interact with doors and buttons. You have a stamina meter in the top left shown in orange. If you’re carrying an item with charge, it will be shown in yellow. You can recharge your items at the spaceship by using the coil on the wall.

Default buttons are
Movement - WASD
Jump - Space
Crouch - Ctrl
Sprint - Shift
Drop - G
Interact - E

On the moons you can encounter different creatures that can vary from peaceful to lethal. There’s also a day/night cycle and different kinds of weather. These will hinder you from grabbing the scrap and delivering it to your spaceship. You can carry several smaller items, but only one larger item. Equipment and scrap both share your 4 slots, so use them wisely. Scrap can be found inside the facility/dungeon that can be entered through the main entrance, hold the interact button to enter.

Some things that may not be obvious
The walkie-talkie needs a pair to function, but you can receive sound as long as it is turned on, it doesn't need to be equipped. To talk, it must be equipped.
You need to pick a destination before you can land. This is done on the terminal by typing in the name of the moon. Only the host can start the ship when starting a new lobby/loading a save. In other cases anyone can land the ship.
You pay to travel to tier 3 moons, but you can stay there as long as you want. You will have to repay if you leave the moon.