Thanks for the screenshot! The problem is most likely due to an incompatibility between your graphics card and the newer Renpy renderer. To fix this:
1. Press Shift + G. This takes you to the options menu.
2. Click these in the order 1 and 2.
The text in the options menu might still be unreadable when you open it, but when you do this and relaunch the game, it should work. Let me know if you still have problems!