Thank you very much for the videos! These will help figure out what's causing the bug.
The third link (https://vimeo.com/728417098) doesn't seem to work, so I couldn't take a look at that.
Can you make the game freeze in World 8, immediately close the game using the X button on the window (or using Task Manager to force close it if the X doesn't work), and then copy everything in the "output_log.txt" file stored in "C:\Users\%USERNAME%\AppData\LocalLow\Last Quarter Studios\Cats are Liquid - A Better Place\" to a site like pastebin.com, and then posting the link here? The log file should have additional information about the freeze that could be useful.
To go to said folder, you can just copy the path I wrote above (without the quotes), press Win+R, paste it to the text box, and press enter. You should then see a folder with the "output_log.txt" file in it.