Uh oh! Yeah that sounds like something isn't loading or setup correctly. Those levels are copies of the original gamejam levels, so yes it's bonus content, but should work fine.
When you have a moment, can you send me the player.log & player-prev.log files to bighandinsky@gmail.com?
Windows: %USERPROFILE%\AppData\LocalLow\BigHandInSky\ForgetfulLoop\Player.log
macOS: ~/Library/Logs/BigHandInSky\ForgetfulLoop/Player.log
Linux: ~/.config/unity3d/BigHandInSky\ForgetfulLoop/Player.log
Otherwise, try closing the app, launching it & try playing one of the levels again? Could be some game state that isn't being cleaned up.
(Edit: and thanks for the kind words 😁, sorry you ran into this bug)