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The code for that part is really simple and works fine for me and my testers, just checked it myself again. My best guess is that your file got damaged. I'll look into it more, but I'm 90% sure the problem is on your end - try redownloading the game and let me know if it fixes the issue.

No worries, your progress won't be lost - you can easily import your all your data  from the old game's save folder.  It's as simple as copy-pasting the files, but feel free to ask  if you need any help ^^

As for the achievements, I might or might not put together a wiki/guide in the future

// edit: the guide has been made 

if it still crashes for you, i think i figured out a fix (it'll be patched in 1.2, but in the meantime you can do it yourself):
open the custom_screens.rpy file in Notepad or any other text editor and replace ShowMenu("kissdesc") with

Show("kissdesc", transition=dissolve)