First of all, I think your warning should be modified.
"contains no sex or nudity, but contains suggestive themes or language, as well as girls kissing girls"
Reading this I thought the romance would be between women, which is no problem at all.
You should warn people that your "suggestive themes" are non-consensual sexual relation and non-consensual groping (yes, when your characters are being sexually assaulted by a succubus, we fall under the "non-consensual" thing).
Because THAT bothered me a lot (and would have bothered me no matter the sex of the characters).
I also could have done without the manga-style VERY suggestive images of those assaults (suggestive images not being the same as suggestive themes...).
Let's say I would have liked to be properly warned, not just led to think the romance was a F/F one.

This said, let's talk about the game.
We are being thrown into the action right from the start without going through the "let me learn" phase of every RPG game, and it's refreshing.
Yet, for people not familiar with RPG, it can be unsettling (I read in the comments that many people were taken by surprise at how hard the first fight is).
Especially since, right after the intro, the character loses her strenght and we're back to "square one, weak character fighting weak enemies".
Nice for seasoned RPG players, not sure if others can handle it.

Playability :
I got the hang of it pretty quickly, but once again, seasonned RPG player.
The font used for the text, as well as the colors, don't help to have a very clear battlefield.
With a few enemies of one kind, and no more than two characters, it's fine. But put more enemies of different kind, and/or a boss, and it gets pretty messy pretty quickly.

This brings me to the visual.
Not being able to see more than my immediat surroundings was fine at first : I was in a poorly lit dungeon, it went well with the atmosphere, ok.
But after an hour of playing while squinting my eyes I got tired of it.
Darkness form time to time, yes, but here it was just too much and got in the way of playability, ESPECIALLY in a game where exploration has a very important part (I felt like I was always...feeling around to find things).

The story :
it's always difficult to give an honest opinion about a story without spoiling everything.
The concept, if not original, is very nice. I like that I have the choice of being nice, neutral or corrupted to the core (but I don't feel like playing this game enough times to see how much the decisions I make can influence the story line).
Talking about the story-line (and trying not to spoil), your game is missing something very important to any RPG : a goal.
At first, I wasn't even sure what my character wanted to do : free herself from the demon ? fight the corruption ? take revenge from the priest (and isn't he dead already) ?
So, I played because I wanted to play, I did what my character was told to do, I fought the enemies I met but...I never thought by myself "I need to do this, I must find that, I have to fight this one, I must go there"


I have this nagging feeling that the plot was just an excuse and that the nasty yuri was the real central element.
Maybe that's just me, cause I was constantly bothered by my characters being sexually assaulted/harassed and had a hard time getting over it (sexual harassment is sexual harassment, even when it's between two women).
Despite that, I tried to focus on the gameplay and the story to give an honest opinion.

The fights were pretty repetitive after a time, the story (as I already said) wasn't enticing me to play and move forward to unravel what would come next...but the game wasn't BAD in itself.
I'd say, full of untapped potential.