Try right-clicking on the screen and see if there is an option to exit replay in the menu (on the left). If renpy is in replay mode, that should show. If it's not there, then you are in normal play, you should try to load an older saved game.
Okay, wow I just tried the same thing on my phone and it breaks renpy. I went tap crazy just to get to the end of the game, after that everything was fine. I don't know if re-installing it would fix the problem, since renpy creates a special save game that is loaded when the game restarted. I don't know where the saved games are stored in android, so I got nothing for you man, sorry.