This is awesome!! I can definitely see this being expanded into a bigger game with these mechanics. I think the sounds and visuals make taking over the body feel very satisfying.
The body fighting off the infection and "reclaiming" parts of it is a great way to add difficulty, and I think can be scaled up easily if you had more levels/reoccurences of this gameplay loop in your game. The only thing I would say is the UX felt a little confusing since I didn't know where was clickable sometimes, but that's a super minor issue.
Overall this is really great and you should totally extend on this in the future!