Thanks for commenting.
The controls were not included in the game on the assumption that they would be reasonably self-explanatory. Most people default to the arrow keys if not provided with control information, and there aren't any special keys to attack, shield, teleport and so on. In terms of the satellites, they begin to appear after 10 points have been collected, and after 20 a black hole appears in the center of the screen and serves as a gravitational force pulling on the ship to make it harder to maneuver.
I won't be changing the game from its current state as this was just a small weekend project, but I'll note to include control information in future games to make things super-clear.
Again thanks for commenting, hope you enjoyed the game.
EDIT: I've included some quick control info in the game. Upon launch "< ^ > TO MOVE" is displayed. Should make things clearer now.