I am not the game's developer. However, I'd like to answer your points with my limited experience of mental illness, and how it can affect the human psyche. I apologize for the amount of words.
1)When you are on test medicine, you are treated as a test subject. Usually, if a test subject calls for the medicine not working to the point of being uncomfortable, they are told to get off the medicine, and in order to be a test subject you cannot take any other types of medicine that produce the same affect(as it could ruin the study). Many test subjects would rather keep trying the medication to get a reaction then call a doctor that treats them like a number and tells them to get off all medicine.
2)I don't know if you missed this point, but I'm sure you noticed the medication had no effect, which is needed to show the full range and strength of the illness. Taking it as directed would most likely produce the same result. While it is always suggested that one should stay calm and take care of oneself byu following all of the doctors orders, you might just be more mentally stable and healthy to realise that, while someone desperate for help would try anything to get better . . . many resulting to suicide. When it comes to mental illness, "good endings" result from friends and family giving the sufferer emotional strength and support, and while it's important to remember this, the simulations one main goal is to show you the experience of a desperate schizophrenic.
3)That indeed would be cool, but I think that might detract from some of the overall feelings the simulation wants you to feel, such as "You are not in control of your environment or self" and, "You are not allowed to relax". Nice idea for a game, maybe not this one ;)
4)Everyone has different kinds of deamons, most commonly sourced from childhood trauma, though that is not the case for everyone. Because of the little we know of the character, and basing on their actions, I took the "hatred, killing and stuff" to be their inner perspective of themselves. The mangled bodies could also represent themselves, but it could instead represent their view of strangers or intruders into their lives, people they feel unsafe around.
No, I'm not the developer of this game, but I understood how to answer your points from my own experiences. I hope it helped, even if it's overly wordy and nonsensical. :)