It wasn't bad, but I got stuck on the last cypher. It said his name, so naturally I assumed "Crypt Killer" or "The Crypt Killer". I got stuck for like 30ish minutes before having to look up a guide, only to find out I only needed to do "Crypt". Other than that, the puzzles were fun! Some were harder than others, but overall it never felt unfair (Other than the last one).
Also, I know the "Crypt" in "Crypt Killer" was highlighted, but I figured it was just to add some extra flair or something.