Thankyou!
Just curious, this happened when someone streamed the game too.
After you beat a level, the game is supposed to save a txt file to the local data, containing the number of unlocked levels.
For whatever reason (on the stream) it didn't do this.
I know because it also saves another value that will alter a piece of dialogue in the first level, letting the player know that they can press backspace to skip dialogue.
I dunno if it's the operating system, or maybe some kind of defensive thing, not trusting an unverified executable.
Could be that in future I have to store saves in the program directory so this issue doesn't crop up with other games. But it's hard to say without knowing the cause. You wouldn't have any idea would you?