I think it’s a really clever game, though sometimes a bit too clever for its own good. The ‘aha’ moments I had throughout were extremely satisfying, especially the ones that made you think outside of the box (like one particular puzzle that made you look somewhere you wouldn’t expect). But as you say, those last few characters did require some guesswork because the clues were extremely vague/esoteric, and that made the game fizzle out a bit at the end.
Overall though it’s among the best puzzle games I’ve ever played.
It seems like a fun little distraction. I’m not gonna spend any money on it though