This has a pretty interesting concept, and ties well with the theme of the jam. I like the art and the fact that you get to watch your boat fall all the way down whenever you mess up. :) The pirate-themed music is cool as well and fits the aesthetic.
I think in its current state the major point of improvement would be the cost of the upgrades. The progression feels so slow and it seems like the upgrades are much needed very early on in the run. (Alternatively, you can put up the upgrades as microtransactions and make lots of real-world money LMAO just kidding).