|My critique just offers my own opinions. Take what works for you and leave the rest.
This was a great read. I enjoyed the story.
The pacing is good. At no time was I tempted to skim a sentence or skip a paragraph. The story unfolds slowly and really draws the reader in.
I think that at the very beginning, there is a bit of "head hopping" when Jen and her husband first bury their son. That part could do with a rewrite.
I like that we are never told the name of Jen's husband. This provides a bit of a detachment from Mikey, and it is clear that it was Jen, as mother, who was closest to the boy.
There are no issues with grammar and spelling.
The character of Jen slowly unravels, as she gives in to her obsession with "bringing back" her son. We see this in the description of her, "Her pale skin was dotted with sores, and her prematurely graying hair was a disheveled nest framing sunken, red-rimmed eyes. The lab smelled of dusty sweat and microwaved meals, but Jen didn’t notice. Time stood still when she was with her baby."
There is foreshadowing of what will happen to Jen, when the power is interrupted and when the boy starts to call Jen by her name rather than "mommy". We can see that he is changing, even though Jen's character doesn't see it.
The dialogue serves to move the story along.
I wonder about the time frame. The mother has worked on the program for three years, and her husband leaves just "a few months ago." I think he would have left sooner than that.
The ending was not totally unexpected for me, as I could see Mikey becoming stronger and needy. At the same time, the ending was a good one. Very believable.
A word on using the "-ly" words. It is often best to avoid them. The story can be stronger without them.
Thank you for an interesting and spooky story.