Impressive little game for a one-day jam!
I loved the progression, although it became quite easy towards the end when I found a particularly lucrative route (not illegal goods).
Since you're mentioning possible future versions, here's some wishes :)
- Some stats of the boats so you know what you're buying (cargo, speed, propulsion system etc). I happened to downgrade to a smuggler boat not knowing that it would be much less cargo than the one I had...
- A minimap of the world would be awesome (perhaps even with trading details of each island once you've visited it)