What a beautiful story you have written. I have a few suggestions: the premise of the story was very moving. I wish you had slowed down. I wish you had explored the relationships in more detail. The story could’ve started with the dysfunctional family relationships and explained a bit more …why the search had continued for so long. The adversarial relationship between the brothers needed some explaining and would’ve given a good sounding board and hook which unfortunately is unusual in the zombie genre. Not just running and fighting and killing the dead – but the people and families left behind after a huge tragedy that would result from a zombie apocalypse. From what I have seen in your writing I believe you are a gifted storyteller and capable writer. The novella came together more like an outline moving from point A to point B to point C to point D to a conclusion.
I would suggest you take this story and expand upon it and re-release it. You have a winner here.
I believe your audience would enjoy digging down into the government experiments as it pertains to the half breeds. the relationships and emotions that develop and grow the more experience a half braid has.
The actual writing of the story was rushed but the storyline was full and has so much more to give and I wish you the best of luck. I will read your other works.
Great ideas. Now go back to the drawing board and write the real novel this could have been.
Best wishes! Thanks for getting me thinking.