I just finished playing through Quern: Undying Thoughts. Really enjoyed it. It feels like a spiritual sequel to Myst. You are on an island and must solve a series of puzzles gradually building knowledge about how the tools on the island work. Puzzle difficulty feels just right for me. Few were immediately obvious. Some made me step away for a day and revisit. None made me check a walkthrough. All of them made sense once complete. There are times that you have to wander around to find something you may have missed, but rewarding when you find it. Total game time was 17 hours. Couldn't recommend this highly enough for fans of puzzle solvers and explorers.