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The video files are loaded in rather than packaged into the application. With them being external, they can be easily swapped out for whatever you want in their spot.

Interesting game. As other comments have said, it's a bit rough that the game doesn't explain how to survive the monsters. 

Also, were the similarities to Spooky's Jump Scare Mansion intentional? You've even got Specimen 7.

That image isn't mine, it's the loading screen for Sandy's Treedome, the level Snowfall plays in.

https://maebea2.itch.io/snowfall-ingame Here's the in-game snowfall.