I started to discover the controls by pressing all keys from my keyboard.
I miss some tutorial or control screen.
Something like "Pick up this box with X (interact button) and let it there with C (landing button) when the astronauts are speaking.
Or another example, apears a text that says "press C for landing" when the ship is near a planet if he never do it before.
Without taking into account that, is a great game, good job!