Hi Garry, I think the comments were contra-productive in your case as they brought you way too much ahead with thinking towards the goals as you actually have progressed. There are in fact more locations that open up as you progress, the church is such a location. My games are always based on progress levels, so sometimes you are doing the right thing but the time is not right.
Ok. Regarding the horses, I don't think it is a bug. You can't take the horses to the stable immediately. You first need to unlock the stable and then you need to be in the stable one time to check if there is enough room for horses / carriage. This process is pretty guided. After you did that you may take the horses to the stable and a little "cutscene" places you there together with horses and carriage. The progress is very linear. Anyway. From what I read, what you did not do is talking to the villagers in the Inn after you brought the horses to the stable. When you initially try to talk to them the reply is that this is not the right time, after you take care of the carriage and you need to wait for the coachman anyway, why shouldn't you? :) once you did that (a few hours pass) you might want to go to the church again. And from what I read you also might want to carefully examine everything on the graveyard. I usually wouldn't give that much advice on the project website, but here in the Jam entries, it's okay :)
Scream for help if something is not clear to you :)