Thank you for the feedback, but feel free to point out the errors that you noticed; especially considering when I copied and pasted my story here a lot of the structure got 'lost in translation'. I tried to quickly edit as much as I could but I know I've missed some.
Ironically, I'm a cat lover. So killing off the kitty made me feel a little bit sad while I was writing it, but it was the way the story was developing in my mind. I'm not always necessarily 'in control' when stories come to mind. Sometimes it's like they write themselves.
I deliberately left the gender of the character 'open ended' - in my opinion it gave ample room for the reader to put themselves directly in the shoes of the character and really feel what they were feeling, which was the ultimate intent.
Shocking grotesqueness is imo, one of my finest points with writing
The afflictions from the 'shadow' - were an attempt to throw in a mix of supernatural aspects, with the psychotic. Persons that are severely mentally disturbed have been known to attack themselves in an hysterical state, but claim they were attacked by an outside force.
I'm hunting down another of my short stories to post here, it's far from being finished, the story kind of stalemated. I know the plot and ultimately where it's going to go, I just don't have any inspiration nor the time to work on it. I will finish it; one day.