Well, after playing the game for hours and reading through most of the pages in this thread I guess I can only say that you have developed a good game here. The artwork and music were great. I enjoyed the setting and plot, and felt drawn in from the start, never becoming bored. I only got frustrated when I failed numerous time to get the true ending. I never would have gotten it if I hadn't found the walkthrough in this thread.
I was playing again and again changing choices that I thought were the ones causing the problem but was never getting any new information because I was choosing the wrong answers from the start.
I never had him draw himself because I thought it would be pointless as a diagnostic tool, so I never got the information that would have led me to think medication would help him, so I never prescribed medication. It's my personal belief that medication is not always the answer and if it's going to be prescribed you should have a strong knowledge of the person's symptoms and a definite belief that medication would help them.
So I ended up stuck in a loop. I could get all the endings except 6, even though I had figured out what was going on even with what little information I had obtained without meeting actually anyone that could help me.
I think this is one the cases where you as a developer/author thought that each player would see/interpret the information exactly as you did or make the choices that you would without accounting for different viewpoints, thus making a lot of extra work for a lot of people. Now, the fact that you made a game compelling enough to get us to do that work to the point of exhaustion is only proof that you are quite a skilled storyteller and your characters were very likable.
Some people have said that the style didn't fit the game, and I think that worked for you rather than against you because when things started to change and crazy things began to happen I was literally afraid. That takes a lot to accomplish. The happy sunny artwork just lulled me into a false sense of security and then when things went haywire it was like a slap to the face. Awesome. I do see what you mean in comparing it to Higrashi, though when I watched that Anime there was still something inherently dark in it that made me expect sinister happenings, so though this is an attempt to be in the same vein, I can't say it's the same device or has the same effect. But the effect it did have was very effective.
As far as Julius, even for this type of medium where characters appear much more youthful than they are, his drawing appeared to be one of a child. I get that he was meant to be youthful and innocent but he looked about 12 years old, so it was hard for me to imagine this supposed romantic feeling from her to him, because he looked like a grade schooler.
It was also hard for me to imagine him as a 27-year-old who wields considerable authority in a professional job.
Overall the game is very high quality, original, and addicting. I just wish the path to the true ending was more accessible.