This could be a number of problems: incompatible phone model, you're running Android 11 (which is buggy with Ren'py), a faulty download, lack of space, even just that you haven't restarted your phone in a while...
Do you get an error message, or does it simply close itself?
If you have a lot of storage space, and turning your phone off and on again doesn't work, then I'm afraid the only thing I can suggest is to download JoiPlay ( https://play.google.com/store/apps/details?id=cyou.joiplay.joiplay&hl=en&gl=US ) and run the Windows version of the game on it.
Sorry I can't be more help!