I don't think I have managed to ever get as many as 15 villagers in any game. The average tends to be about 3 or 4 with 3 or 4 children. The algie tends to arrive more often than not, even though I only have one villager fishing. Then I switch to coconut harvesting (in at attempt to avoid over fishing and getting the algie) it still fails and everyone dies.

We all do the 'children collecting duplicate collectibles' thing, that hasn't helped either - and it is interesting that we all experience the same basic problems.