I would take this and adjust the height for a slide, include more of an angle on the ladder for my younger son and put a beam out the side for a swing .and maybe a sandbox underneath instead of a solid floor?
Log Cabin lots of interior space to work with. Could see this as a cape code w a shed roof to the rear. Add 3 bedrooms upstairs expand the dining and living space into the bedroom. Shrink the bathroom to a powder room and then swap spots with the kitch