From what little I could find, it should work on Android 6, but thats not officially from Arcs pages so you may want to reply directly to him and ask (so he gets notified)
As long as your updated your right about the version you have, ironically the A12 shipped with Android 10 haha.
I play on PC and don’t have the space for a test run, what I can tell you is make sure your download is approx. 1.19 - 1.20 GB
Itch has a weird habit of interrupting mobile data downloads and them resuming which sometimes leaves you with half the file AND a second full copy at least on Windows.
Not really my area of expertise. I know more about the pain of the dev kit than I do about playing games on my phone.
I’m still running Android 8 just to keep my real Keyboard and avoid touch screen lol.
CursedFlame or Arc will have a much better answer for you here, they both know more about the Android version than I do.
Sorry I can’t be more help.