Alright. I had my fun (and lot of learning), now you can have yours!
How many Santas will it cost you to deliver the gifts?
Structures and most props are from the Unity asset store, but all animated assets (except for fallers in level 3) and main gameplay details like sleigh and helicopters I made in Blender. And some props, too.
It was lots of baking and research. And wasted models (the total amount of wasted Santas is incalculatable).