Despite the cheerful visual, I felt there was an air of melancholy (maybe because the characters keep talking about the void). At first I thought there was only one conversation per NPC, but was pleasantly surprised when I found that the conversation changed depending on the progression and /or how often you speak to them.
With the main protagonist, I originally thought that it continued to face forward when it was facing away from the viewer - but I see that it is facing the correct way, though maybe the angle is a bit strange. I think it might be more natural just to see the back of the head (if it looks too simple, maybe you could add a tail on the back)