Hello, I played the game and loved it a lot! As a nonbinary person this resonated SO much and I'd be really excited to see any future games continuing this story. I wish the protagonist and the monster sibling could be happy together!
I've noticed other people also got the glitch of the game crashing in an infinite loop from pressing the cancel button. I figured out how to fix it in my playthrough! It's something in the portraitless save menu script messing up and it crashes the game cos it's looking for a portrait file (even though it doesn't need it). Just putting any file in the faces folder and naming it Actor1.png makes it all work again. (Even a blank file or a random meme lol!)
Hope that can help!