I kind of feel bad for the MC and just want her to return to her regular size. I also wish that she was able to do things like modifications like putting different cat ears on or give pity to her and increase her bust size. I'm also kind of hoping that they'd all turn into humans by the end of the story. Wouldn't be the most outrages thing.
Protagonist gets turned doll-sized to be played with by loner with supernatural abilities and has to show her the magic friendship to break the pseudo-curse.
Yup. Most definitely comedy. No psychological horror here.