Good work on the score! Thanks for the suggestions, there's definitely scope for fleshing this out I think :)
I did actually have to put a cap on the number, as like you say it can sometimes turn into an infinite cycle which was actually hanging the browser :D
I think there's a bug in my code though as it's supposed to cap at 3000 but obviously people are still getting higher, probably for the best really as it's not hanging and it doesn't look like theres a specific hard cap on the scores, so best of both worlds!
Long term I think I can rewrite the renderer/optimise the path finding to allow for more organisms, I just ran out of time...