You're being chased by a huge, evil snowball. Run for your life and try to shake it off by changing direction from time to time. Will you mind the evil penguins, too? You can jump on top of them, though. This is not the case when you see spikes in front of you: as soon as you land on top of them, the game's over. Collect all the suns and rush to the exit!
Use the arrow keys or WAD to run and jump (arrow up or W = jump).