I took a look at the permission list on your Play Store page, and I think that's way too many permissions required for an app that purportedly value privacy and works offline and locally.
I downloaded and played with it a while. Other than the overall cosmetic defects, here is my observation w.r.t the gameplay:
1. It wasn't clear to me what the buttons with cloud snowing meant to me. It's not explained in the onboarding 'How to play'.
2. The gameplay pretty much ended for me coz...
I created this app. I had the same needs as OP, and couldn't find an app that fulfills them, so I decided to build it myself, and I have been using it since then :)