Hello Grey1103,
Unfortunately, I will be Rejecting your map.
The theme isn't very original, there are already quite a few Christmas maps, however none exactly like this, which is good.
The build is good, the inside is nicely detailed and is overall well built, so well done!
The parkour is quite repetitive. A lot of the parkour was made up of parts of the build itself, which is nice as it doesn't look too messy, but it does make the jumps quite repetitive and boring. There are also a few sections where you group similar types of jumps. What I mean by this, is that there are sections that are just normal blocks, then just glass panes etc. Try to avoid this where possible, and mix up the jumps a bit more, experimenting with a larger variety of blocks and items. This will make your map overall more enjoyable to complete.
The difficulty is quite infrequent throughout the map. There are a few jumps that suit an expert, as well as a lot that would suit an easy/medium. I would suggest trying to even out the difficulty more, rather than having it unbalanced, as it could make an easy/medium map too difficult, and an expert too easy.
The length is good for an expert/insane.
Thanks for submitting your map! I hope to see more maps from you in the future.