If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Sadly Santa is not having enough time to deliver all the presents himself, so he calls the help of.. Christmas cat. Jump from roof to roof, knock of some other cats, and try to deliver all the presents into the chimneys, before Christmas day.
Arrow Keys - Move.
Spacebar - Tackle.F - Drop Present.
D - Jetpack.