if you are playing the web version I recommend you downloading the application instead, if you are using the application then I recommend you using the UnityCrashHandler, hopefully it'll fix your problem, or either that or swapping pretty the 32bit build instead. (which is downloading the TFOL.Windows32bit.Act2Official.220927.r4.zip)
Still happened with the 32 bit, tried deleting the progress and starting a new run and still cant progress further after the first ringing of the bell, though I can still hear the background music playing, I've also tried waiting out still no change. Looks like the game doesnt want me to progress further :D