Amazing dedication and experimentation!
Fun secret though: if you keep adding balloons after achieving shiphood (like 80 more, Skelly keeps talking to you as you do), you unlock hot air balloons and eventually rockets and get to fly truly sky high. UP there lies the true ending, and as a treat the physics gets much worse along the way.
Anyway, thanks for playing! Blasting 30m up out of the water is pretty sweet haha