This mod is a moon called Christmas Village that was embed in LethalExpansion between 22nd december and 3rd junuary.
Github repository
Features :

I will maybe open a Discord for support if the mod gets a lot of users, meanwhile you can use the github's issue tab. Please enable the fellowing settings in the "BepInEx.cfg" setting file from the "Lethal Company\BepInEx\config" folder:
[Logging]
UnityLogListening = true
[Logging.Console]
Enabled = true
[Logging.Disk]
WriteUnityLog = true
Then send the "LogOutput.log" file from the "Lethal Company\BepInEx" folder in the bug report.
- Pixabay
- https://youtu.be/n8xGzkizA34
- https://assetstore.unity.com/packages/3d/environments/landscapes/flatpoly-winter-village-51544
- https://assetstore.unity.com/packages/3d/environments/landscapes/lowpoly-style-free-rocks-and-plants-145133
- https://assetstore.unity.com/packages/3d/environments/low-poly-woods-lifestyle-65306
- https://assetstore.unity.com/packages/3d/props/pbr-christmas-gifts-237877
- https://assetstore.unity.com/packages/3d/props/free-christmas-assets-low-poly-13102
- https://assetstore.unity.com/packages/3d/props/food/christmas-cookies-breakable-105913
- https://assetstore.unity.com/packages/3d/props/free-christmas-presents-low-poly-24356