So far, the back button and scroll wheel seems to work normally for most players (including myself, I test each version on multiple computers), and I haven't made any changes that would disable this behavior.
It's possible it could be caused by a temporary glitch, a corrupted save, or even a Ren'Py engine quirk on your system.
Could you try:
- Starting a new game
- Testing in windowed mode (rarely, fullscreen setups interfere)
- Delete any persistent file in the save folder (may be corrupted?) and in C:\Users\[NAME]\AppData\Roaming\RenPy\Cheerleaders
- Unplung any gamepad or controller (some can disable rollback behavior in Ren'Py)
Also, which version are you using right now? The last one, v1.1?
Are you on PC? Mac? Android?