So the boat just wanted to mess with him?

Apparently. I assume Possessed Boat was just bored and wanted to play ))))

Then she gently drop him off at his home and even returned his own boat. Which - does it mean his small raft has consciousness now too? Or Possessed Boat has powers to order small raft to sail when its orders it? )))))

Actually it was fun little movie. I enjoyed its originality. I dont think we had a possessed boat before. It was original. And very well shot.