I loved the concept and could definitely see myself enjoying it but I did have problems with a few things:
1. The upgrades cost too much and take too long to get to the island, maybe having the upgrades be cheaper initially and then scale based on how many of that upgrade you have?
2. The pirates kept stealing all my money! My timer got frozen at 1:09 so I was like "cool lemme just grind some money and buy some upgrades" but every time I had more than 50 dollars I would get spammed by pirates and lose it all on a single trip
I would really love to see this game grow! Overall great job!