no guide that i know of, but ill let you know what i can remember:
- the alchemist only has some extra dialogue if you collect an item somewhere and come back to him, theres nothing fancier than that.
- I think there are only five endings, one is much more insane than the others but they all just reset the game after.
-beyond that there are just a bunch of little secrets, some of which are quite hard to find.
hope that helps, thanks for playing!