Oh yeah, I was wondering if it might have been the timer ending, but I wasn't focusing on it and didn't know how close to ending it was. I have a Intel Core i5-2500 CPU @3.30Ghz, 8 GB of RAM, Nvidia GeForce GTX 1060 6GB, running Win 10 and I had a ton of tabs open in Chrome which most likely didn't help.
Hey, thanks for the info! I managed to fix the crash - turns out I hadn't initialised a pointer to the end game text message properly! As a result the game would only crash at the end if the memory allocated to the pointer didn't have a value of zero... I've got a build ready to go with that crash fixed which I'll update as soon as the jam voting stage is over.