Mobile version is unstable and bound to be error prone, hence the "experimental" in the file name
It all comes down to the fact, that the dev mainly develops the game for Windows platform and the source code is written with this thought in mind, Android build doesn't have separate source code or it's section in the main one, rather Godot let's dev export the code as android build and the result is what you can see.
However, he has plans to dedicate his full attention and time into creating an actual Android build based off of his current code, which should drastically reduce the amount of issues you guys experience, improve overall stability and avoid crashes all together.
Unfortunately these are his plans, which will take time to be fulfilled, until then you'll have to play the game as is or wait for it to happen.
Hope this clears confusion,
Cheers