My guess is a corrupted download or a graphics driver/hardware incompatibility somewhere as we do some file splitting for animations. This doc link describes some Ren'Py graphics-related info: https://www.renpy.org/doc/html/display_problems.html
We can't seem to reproduce the issue on our end, but we'll try to take a look into it. Could you let me know the specs (OS, CPU, GPU, RAM) of your computer that you're using to play this game?