I'm sorry that you weren't able to save them.

How many villagers did you have in your tribe? If it was more than about 12 villagers, it can be really difficult to get enough food for them from just the farm and coconuts. You can use what you've learned from this game and play again. Maybe you could make backups of your game periodically, in case something goes wrong again. Then you would be able to try a different strategy. You can see how to back up your game here.