Took me probably a couple of hours to beat the game the first time, then I played it several more times after that - not because of the claimed replayability (I'll get to that in a moment), but in order to try to provide some solid feedback.
I'll start by saying the art is great, the game has some character, some of the puzzles felt kind of clever for such a simple game and interface, and I'm kind of interested to see what might be next, given this labels itself as a chapter 1.
It's definitely a phone-oriented game though - that's clear. The timing is a bit tight for a mouse, and way too tight for a touchpad (maybe with practice). I finally beat it because my laptop has a touch screen. I have not yet tried it on my phone - but if that's the target demographic, then the timing might be okay - except...
Even though you have 60 seconds, I feel like it's closer to 45 or so given how much time is spent waiting for item pick-up animations to run (although I'd have to time it. Sometimes it feels like I was able to do other things while the animation was running, sometimes not. So I'm not quite sure what's happening there. And the dog can use up a very random amount of time. I had one playthrough where I think I spent nearly 10 seconds waiting for the dog to bring up the missing page.
So, between the animations and the dog, assume you've got maybe 40 seconds to do everything. You can't waste time going back and forth between screens looking for things, and checking the book. Which bring me to the replayability point - the only way I found to feasibly beat the game was to figure out everything I needed to grab (since most items don't change, only their location), and then just grab everything while looking for the book. Read the book to find what card I need, grab it, then drop the fish in the pot. Once that's the approach, moving items around doesn't really add much replayability to it.
My one constructive criticism about replaying is about how the items move and change. While I think I agree that just having three numbers sitting out in the open might make the safe code a bit too easy, since most items just move around randomly, realizing that the numbers will always be in the same place, and in order, but might be representing by things that look nothing like numbers I think is a bit of an intuitive leap given how different that is from the rest of the items. I didn't beat the game the first time until I lucked out and got all numbers. Then when I finally confirmed that was the safe code, I was able to go replay and hunt and try to figure out where other "numbers" might be.
