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The book definitely raised a few quibbles for me (ending, method of possible world destruction, connection to Alzheimer's) but I liked the concept and the attempts to do over until you got it right plot. Barry and Helena's stories are separate for a good portion of the book while they question the action until they get to what the problem actually is and try to do something about it. This and their attempts to resolve the problem work for me.

What didn't was their relationship which was one of those plots that tell you something rather than showing it. It refers to their loving relationship but I never saw them get there. For speculative fiction it was a good idea and something to ponder.

Looks like we were flip-flopped on this and The Midnight Library. This was a solid 5 for me while the latter I was kinda 'meh on.

I hadn't thought about the relationship being more tell than show, but now that you mention it I think you are right.
The plot device really kept me distracted from that though.