Woops! Sorry! :c But thanks for the bug report!
Do you remember anything else about how it crashed? (Did it crash right when you put the key or after the animation of opening the lock? In which version were you playing it? Web or downloaded? windows, mac or linux?)
Also, I' m glad you enjoyed it while it lasted! (Sad you didn't get to see the ending, cuz I think it's important for the theme of the jam; if you want to see it, at the end of the game page there is a comment I left with tips and tricks that may help you progress faster the second playtrhough!)