Overall it's a good game however I do think the balancing could use some work; Also a suggestion to make the game last longer: try adding an upgrade where you can increase the percentage of money you earn from drift wood and stuff like that maybe 5 - 10% per upgrade.
On a side note this is by far one of the most original games i have ever played and I think it deserves more attention, do NOT be discouraged by what other people say, and ignore negative comments. I myself think that the game has great potential, and would like to see more updates to come. ;)
Thx for reading