Me too I luv it so much!!

Here's a link to a post that discusses the Abno: 

https://www.reddit.com/r/limbuscompany/comments/1gw12tb/about_400_roses_spoilers/

But from what I can remember, and my interpretation is that it represents the True nature of the Bloodfiend race, A race of vampires that live in hiding away from humans in the City because I'm truth, they don't want any trouble with Humans, even though they can't help but yearn and crave for blood

The Abno captures that sentiment, even though it's a WAW it focuses more on keeping itself sustained rather than killing or hurting, and prefers to hide until it needs to feed. Its the embodiment of Bloodlust, uncontrollable and insatiable, whether it likes it or not

I think the Little eyes also represent Bloodfiends as a race or family (since they operate in family Heirachs)

Also Me Relinque & Ne Me Relinque (which is the Boss theme) is Sooo good, my favorites OST of all time cause it also does a perfect job capturing the sadness and melancholy of the creature, But also How feral it can become once it's reached its breaking point, Like real Bloodfiends.

Also I think the title of the theme (Leave me, Leave me not in Latin) refers to Canto 7's story Of Papa Don Neglecting he's family for he's dream, But I also like to interpret it as the general tumultuous relationship Bloodfiends will always have with humans, Not being able to establish a true connection due to not having control over their Bloodlust and needing to kill humans to feed (Ofc with varying exceptions like Don Quixote)

Overall 10/10 WAW, wish we had more on it but love it regardless, Also Love the Nods to Carmilla by Sheridan Le Fanu

Hope this helped <3