I never think your work is A.I in any way, bunbun. Everything you made since the demo until it was finished is clearly handmade from the coding, story and down to the characters. I'm sorry someone lumped that together 💔.
This is why i hate a.i since its emergence. As a non-native and non-fluent english speaker, who often wrote fanfics, my vocabularies are not as wide as those who are fluent nor like the natives. So i get accused A LOT of using A.I these days compared to before A.I is a thing - just because my lack of grammar.
Great Artists are also affected by A.I. Nowadays, if Artists don't share their process or the vid, their works will be accused as A.I image. Sharing process and vid of the artworks feels mandatory now - something that clearly killed the Artist' joy more often than not.
I can't imagine how bad careless accusations will continue if the A.I pandemic has reached game developers area.
I'm sorry that happened to you ❤️🩹.