Very intriguing. Pretty darn clever puzzles too. I particularly liked determining the hammock assignments. One slight usability improvement I'd like to suggest is to have the ability to clear a square in the doctor's puzzle. The inability to do so made me prefer to solve it outside of the game as I couldn't undo a placement making it difficult to see which letters I'd placed correctly and which I hadn't.
For me the biggest challenge was determining the location order at the end and I admit I "cheated".