User Guide / Cheat Sheet
After the intro video, move the mouse around to fly to the other planets, the spaceship wil automaticall follow the mouse around. To visit a planet simply click on it.

Returning to earth at any point will show your current progress through the game, by showing you how many crystals you have collected. There are 4 alltogether.
Murcury & Mars are very straightforward to complete & should not cause any problems.
The moon - the circled landing site below is the correct one.
Venus - this is the approximate location of the crystal