Shooter Around Planets

One day you saw a strange starship heading toward you.
On board your little space ship, you took a seat in the cockpit took your favorite soda.

When suddenly you saw many ships approaching you at high speed, panicked you fire at these ships.
Since that day, ships are continuously arriving but no one knows why ...

To move grab the little mouse that walk under your seat, you examine it, there are 2 buttons.
The one on the left is identified but the inscription is sightly erased, you can read F.re.
On the right it's not identified. I will let you to find out  what it's for.