This was a lot of fun. It's a cute little story with a good message underpinning it and some fun supernatural elements. I'd be interested to see where you go with it. I like how it's pretty obvious that Ophelia has self esteem issues too but Amelia doesn't realize it because she's caught up in her own problems. I hope the full game explores that a bit, not just the
I kept thinking this was going to be a branching paths story but it doesn't seem to be. What if I didn't wear the costume on the second day? What if I decided to duck out after Ophelia left me alone at school the first day and pretended to be sick? What if I misremembered the path to school from day 1 and took a wrong turn while running in the nightmare world? Or what if I forgot to look both ways for cars in the nightmare and got hit? What if I failed to hide from the monster? So many cool things to consider if you wanted to go that way.
It was a little hard to follow who was speaking in the dialogue. Maybe you could add a nameplate to the textbox, or change the dialogue color to match the person. Some of the dialogue was a little confusing at times too, but I'd say that's mostly because of the translation being a little rough in spots. I didn't get that the boy was giving me a little casket until I came home and saw it on the desk. Also in English at least here in the US the word "casket" refers pretty much exclusively to a coffin, so that felt like it had a threatening subtext I don't think it was supposed to. The conversation with the boys on day 2 where they make fun of you for wearing a costume seemed pretty weird because they said I "always" change my image and I'm wearing another costume "again." Isn't this the second day of school? I don't think they know Amelia well enough to make that kind of assumption.
The game's a little unpolished still, of course, but the story gripped me from start to finish, so I'm looking forward to seeing what more you do with this.