Cool idea! Santa really is scary if you think about it.
I had some issues with the sensitivity, but got it sorted out, not sure if it's a Unity thing. Everything else was good.
You did a great job of creating atmosphere despite the simplicity of the models and time restraint. Sneaking past Santa was a good feeling and made me feel like I outsmarted him.
If you have more time to work on this, adding more complex routes and options like air ducts and catwalks could make the game even more fun.
Great work! Try my game out when you can!