Thanks for letting me know!
This should now be fixed, I think. The bug was due to my misusing two if statements instead of an if/else statement on one choice, basically, which resulted in no choice showing up at all sometimes when you hit that point.
I couldn’t find a second place where it ended abruptly–only one! So I think the second time you actually got to the ending. I did my testing in the Ink IDE and totally failed to realize it didn’t show “End of story” after exporting. So I’ve tweaked the ending to make it really clear when you’ve hit the end.