I love the sophisticated design of this game. I immediately paid the fair IAP to remove the unobtrusive banner ads and support the developer. Doing so also unlocked other modes, so there are lots of ways to play this, from casual to more difficult.
My only complaints are, it does not save progress mid-game. So if you have to quit the app, you just have to start a new game. Not being able to save mid-game was a big oversight in the programming. It could also use a bit of battery optimization. It’s not horrible, but it could be better. Also it doesn’t look like it’ll ever be updated, it’s been like two years.
Still, with those caveats, I do recommend this game. It’s very well done overall.