The puzzles in this game are mostly on the harder side of average, with a few stumpers thrown in for good measure, but the harder puzzles can still be reasoned through with patience, and a bit of logic and note-taking.
I was thoroughly enjoying the game until my phone broke and I reinstalled on my new phone. My progress appears to have been saved to Game Center (great!) but the game now loads into level select and then ceases to respond to touch inputs. Tried uninstalling and reinstalling, but nothing changed, so my progress probably got corrupted somehow. Here’s hoping for a fix, but I may need to reset the game data and do everything over again :(