Just finished this! I enjoyed my time with it.
I especially loved how the finished puzzles were placed in the context of a gallery, though I wished the text that had accompanied the puzzles was included somehow, or else meta commentary about the stories. I was saddened to find that only the Mondrian exhibit had that, I would have loved to know the inspiration/thought process behind the other two.
The opening dialogue was extremely charming (a non-judgemental response to asking what a museum is!), and none of the mechanics overstayed their welcome.