Start26 is the last level of the campaign.
Start27 is a dialogue within rocky hall in which Turner rules over the island, and Fiver points out a village that is hosting a protest.
Start28 is a dialogue within rocky hall in which Turner says that the protest won't become dangerous, and the guards approve of it.
Start29 is a dialogue in a new map where Turner talks to the bunnies of that village and kills them.
Start30 is a dialogue within rocky hall in which he says he killed all the protestors and the bunnies disapprove.
It looks like Start27 is an alternate ending, and then Start28 and Start29-30 are branches of this alternate ending, one where Turner is a competent ruler, and one where he becomes mad with power. Interesting...
I bet a bunch of people have seen this already, but I'm pointing it out anyway.