I love the idea for the game, but was wondering if there is any plan for the option to change your gender. I'm not talking just male or female, but even non-binary, futa, or more.

What would that involve? Your game pronounce, or the art for the girl version, too?

If it's the first, there is possibility. If you donate and vote in a poll, it will be possible.

If it's about girly character art, especially vagina, I doubt it will get added 

Both the pronouns and the vagina part of things.

Hi, “pronoun options” are in the works, according to the patreon channels. I doubt the genital bits are going to change though. pronouns are easy enough with an editor, but genital stuff would require new scripts for the scenes, as well as new artwork, and that’s a lot of work.