Ubik

Thankfully NOT a game about fighting Santa's hemorrhoids so he can sit in the sleigh, instead you shoot Christmas themed asteroids with a tree shaped ship. Released as a bonus demo game on original European release disk of "Delta" / a.k.a. "Ubik".

You have discovered a plot by evil aliens to take over the world!! They have created robotic imitations of Christmas tree decorations and Christmas puddings. These fiendish devices are to be substituted for the real things in people's homes all over the planet!