The Android version is only available through an itch.io purchase or through a Google Play purchase (not recommended, only censored version available).
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Thank you very much for your kind words!
While an outright sequel is unlikely, there may be another game or DLC set in the same universe, potentially featuring some familiar characters. We wouldn't be able to set a date on it yet, but the possibility is definitely there. ^^
Can you attach more detailed screenshots and descriptions of where exactly it happens? What is the exception? Are you playing on Android or Windows/Mac/Linux? What is your MC's customization options?
Buying on itch will give you Windows/Mac/Linux, Steam code, and Android versions. Buying on Steam will give you only a Steam code for Windows/Mac/Linux. Google play will only give an Android version.
There should be an update in the Steam version that also fixes achievements not showing up. There was one report of a problem with seen text (that we can't reproduce), and a problem with certain saves being incompatible though, so you might want to make a backup.
Have you been able to install other apps outside of the Play store before? Can you try some of the options in the below links?
https://www.geekinstructor.com/2019/03/fix-app-not-installed-error-android.html (Editing the setting in the Play store)
https://www.digitbin.com/app-not-installed-fix-error/ (Options 3, 6, and 7)