I think the telltale sign would be the game hanging, but I don’t see many other non-obvious problems with it. Actually, when you run the standalone game it doesn’t even have the limit. But then you lose the output log and print screen unless there is a way to turn those back on that I don’t know about. All in all, I think they could have a much less intrusive(and useful) way of telling you there is a problem rather than by just shutting you down completely, and then not giving you any useful information at the same time.
I know very little about ray casting. Amit seems to have a pretty good article that covers it though: http://www.redblobgames.com/articles/visibility/
Something I am definitely going to need so I will have to spend some time working on it when I get to that point. 