Simple pixel art, but very compelling story telling and is visually stunning. I remember reading a manga about the back story of Yuyuko, which echos with what you have shown in this game.
Then moment when the on screen instruction says "Play", yet Yuyuko ends up killing the grandpa/ma with her power made me feel things (as mentioned by White Pikmin earlier).
I wish the game isn't that challenging though. I go stuck at one stage and I still can't clear the stage at this moment. Probably because I'm a bad player though. Will try again to see end of the story.