Cool idea, but a lot of work on just fixing things. I've had a lot of fun just adding parts to the island till it got so big it started spazzing out on newly spawned island pieces and connecting some of them would make the island launch itself. The workers seem to just die of hunger at random right next to a full wheat field and a full storage of food.
A thing that would help a lot would be tooltips over the buildings before picking what to built and right click to cancel building if you change your mind or click on accident.
Maybe some sort of mission or milestone system would be great.
The players should know what they are aiming for instead of just randomly building things and traveling till something new gets unlocked.
Overall a good prototype, just needs more stuff and a bit of polish.