JoiPlay can be used as emulator to play Ren'Py games on a phone.
Viewing post in Sensei Overnight (NSFW 18+) comments
Ren'Py has a limit of 2 GB for its Android package builds. Some authors do workarounds, like separating the game across multiple downloadable versions (where save files at the end of the first release will load into the second release), or releasing a version with heavily compressed assets (leading to visual quality loss and sometimes just getting rid of music altogether), but many don't bother.