If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Space bar- Boost.
Use mouse to aim.
Hold the button to wind up, release it to throw a snowball.
Esc key- Pause.
The aim of the game is to get to the spaceship first! Win each race to also unlock each level! But be careful, you should watch your temperature, if you get too hot you will explode but use the snowmen to cool off by hitting them and don't forget to throw the snowballs at the Aliens too. Fun!