If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Make sure the traffic in space runs smooth by controlling it. You have to click once on the hovercraft to stop it and twice to give it some turbo power and make it go really fast. In each level you have to pass a certain number of hovercrafts in order to finish it. Be careful, because if they crash into each other, you lose. If you succeed in completing a level in normal mode, you unlock it in survival mode, where you can play for as long as you can in order to get a high score. Have an amazing time!
Click once to stop the hovercrafts and twice to make the move faster.