One thing I'm noticing here is the absolute detail with the characters. When we know in detail about the characters thoughts and feelings, the characters and story begin to feel immersive.
Yea, it is not very common that we know whole backstory of each character from the beginning, but it really help with understanding their feelings, decisions they make and reactions. As a readers we don't have to suspect what the second one think, cause we have whole perspective from both characters.
omg I wrote riders instead of readers and someone read it, its so embarrassing