As described by others, it feels like it's more mid-development.
I do enjoy the Remia-Artwork when checking her status. Would be cool to give her a few more inbetween states between in control and fully submissive, to show her gradual digression.
My main issue is the lack of knowledge. Finding clues so far is a gamble and trying to keep Remia save is near impossible.
Idea if you don't want to make this a visual novel: make it a "find the difference" game. Each location has a base-sprite and for each difference hidden in it you can send either yourself our Remia. So if there's only one difference you can find only one clue, Two differences for two clues. But if there's a specific Element hidden in it (like a heart?) it will also increase Remia's submissiveness.