Thanks, so after looking up the specs on that device it seems that it does have enough RAM (4GB). However the CPU and GPU don't seem to be recommended for mid-heavy gaming since this tablet is geared more towards productivity apps.
With that said, since this game does require a fair amount of video decoding to be done by the CPU, I suspect that this might be the underlying issue. Assuming you played the normal build, I would give the [Compressed] version a try since it is using an older version of Ren'Py that performs better on general-purpose Android devices. All the animations are capped at 30FPS in the [Compressed] version, so it should be easier on the CPU as well.
If it still performs poorly, feel free to let me know and I'll see if I can optimize the compressed version more.