It was either when the next-level dialog popped up, or when I clicked the next-level arrow.
So, yeah, I think it may be a can't-load-level-4 crash.
Cool, thanks for your input! By the way, considering you played until the last level, can I get your feedback on what you liked/didn't like?
it was a bit too easy for dots not part of the line you were making/following to trigger and it was also a bit too easy to lose contact with the line one was following.
Thanks for the feedback!