13 on galaxy tab s6 lite
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.