I'm not a regular player of this genre, therefore, I'm not sure how much I can analyze it.
First, the art, color palette and music blend very well together. I would suggest better contrast in the dialog boxes, and different text colors between characters, so is easier to follow.
At first, I found it very short. The 'Restart' give me a hint that I should probably choose different answers. That's how I got to a second ending. This part should be made more explicit at any ending: explain to the player they can play it again, so they found the different endings.