thanks for trying out the game!
I had hoped to add an inventory system, with items to pick up and then other enemy types, but due to time had to settle with the rum bottle being the only item which was instant use on pickup. I agree as it stands the game lacks complexity for a roguelike.
The win condition of picking up 6 chests was a rush job in the 11th hour to add a win condition, and the sea horse spawn rate acts like a hunger clock. Eventually they start spawning in pairs and then threes. I think you actually destroyed a spawned pair at the end but they reached you at different times. You also managed to complete the game without using the ability to destroy pirate ships by ramming into them!
nice find with the spawn rate bug, you are correct on each retry it should reset to 30% but it's just carrying over from the previous run