I'm actually planning to replace second-to-last level (westw.bound) and release an updated version of the campaign, without neutrals in prisons. Hopefully this month. Based on your feedback, I'll also add more hints to the level.
Yeah you were doing fine - there's nothing to do except heading east, although eliminating the blue keeper was a waste of (precious) time and actually rendering the level unwinnable as you'll need him later on. - a warning will be added too.
Don't hesitate to use the walktrough in my first post for now. This is not a straightforward level.