The video’s maker explains:
So, every year my school holds a door-decorating contest at Christmas time. This year, the plan was to have me make this Christmas vs. Hanukkah space battle animation, and play it on a laptop attached to the door, while also projecting a neat light effect onto some thin paper over the doors window. We won! I thought some people might enjoy seeing it.
The Christmas battleship is modelled [sic] after a Christmas tree, while the Hanukkah ship is a star of David. The fighters are sleds and dreidel.
At the end, it turns a little political.