The idea is pretty neat! I would have liked to know how much water is already on the boat, so how stressed should I currently be, like a UI element that says 75/100 or something. Also I kind of struggled with moving in the narrow spaces on the boat, which was a bit frustrating for me - I think it would have been more fun, if I could move more easily, and the difficulty came from something else, like just managing the patches.
I can imagine this prototype becoming a really cool experience though, with a little more time and polish!