The story definitely has its own voice. I would consider leaving more to mystery though; the fourth and fifth paragraphs seem a little too expository and plain. Could there be some other way of setting up for sequels without giving away too much?
This reminded me somewhat of the opening pages of “Along Came a Spider” by James Patterson. The sneaking intruder with his shady plans.
Very well written. Really sucked me in and engaged me. The visuals were strong without being over detailed. It allowed my imagination to paint a picture of the world without drowning in details.