Thank you so much!! So happy you enjoyed the game. For Cassy, the game actually tracks her relationship with Hastur, not with you, which is part of his arc, but will also affect your relationship with both.
For the bug you found! Good to place to update all readers: there's indeed a bug in the itch.io version of the game, BUT the bug only occurs when finished the game, so you just missed out on a “Thank you for reading” page lol.
I will fix it in the future, but it will reset everyone’s saves, so waiting for a while until everyone finished their playthroughs.
Will also give a warning before updating ofc :D