This felt unsettling and left me with more questions than answers. I had a pretty good idea what sort of deal had been made between the two villages early on, but I still was left wanting more details. I wanted to learn more about the village and your role in it. I wanted to know more about the relationship between the main character and her sister. Were things different this time because of who was picked, or was it because of how long this arrangement had been going on? You don’t need to answer any of them, of course, but I was left wanting more.
The art style has a surreal feel to it, leaving me with more of an impression of what I was seeing instead of a firm image. I think it worked well for the game, helping give it that unsettling and supernatural feeling.
Some of the sound effects felt a little loud compared to the music. I was pretty sure in some cases that was deliberate, to be startling and make the player jump, but at times the sound effects felt too loud. I liked that I could adjust the music and sound volumes separately, though it would have been nice if there had been an example sound effect when adjusting the sound to help let me balance things better.
In the Help menu, it mentions being able to use the mouse scroll wheel to go back to earlier dialogue or move forward to later dialogue. In game, the scroll wheel did not seem to do anything. I had acknowledged that the “Back” option in game was greyed out, so had figured you had disabled that feature completely. You may want to see if you can change the default Help text so that it doesn’t include options that aren’t used in your game.