This was a straight, fast-forward story that took no detours but delivered with each sentence. The author did a great job describing the confused thoughts and mixed feelings of a ten-year-old boy. However, I would have loved if the author had put more focus on David's internal struggle between his own conscience and the mosquito's presence instead of just letting it take over.
I also missed some explanation of the origin of the mosquito and its motivation (besides the obvious...). I imagined something like an alien force or the ghost of an ancient creature that took hold of the little bloodsucking pest, or maybe even a hive-like collective mind. But I will never know for sure...
Still, Mosquitos is a recommendable, original horror novella which I enjoyed very much