Click the flag to start the game. You can steer the cat around using the arrow keys. You'll start off with one dragon, but as time goes on it will bring some friends along. If you hit a dragon, you lose!
This is a fairly straightforward dodge-the-baddy game. The cat moves faster than the dragons, and it should be possible to get quite a few dragons going before you're caught. I haven't done much experimenting with the clone function in scratch - I like it.