Hmm, that was interesting. I agree that it suffered a bit at the end, but I think that's more due to it's brevity than anything else. The setup was interesting, but the conflict was very abbreviated and the revelations came with minimal effort on the protagonists part. That there was little to no foreshadowing of the supernatural and that the end was carried by something of a deus ex machina was also disappointing, which is compounded by the protagonists lack of agency at the end and the relatively sad ending.
It's unfortunate really. The supernatural portion of the conceit seemed like it had lots of potential, it actually reminded me of xxxHolic, but they did nothing with it. Stopping time with a wish shouldn't be something so minor that it can be brushed away with a single mention and there's a lot that can be done with characters who are in the know dropping in and out of the frozen time. Besides that, if one person's wish can stop time, imagine what else could be done.