I think I would enjoy the game more if the line would contract (and have the possibility of causing a "match") whenever there are like-coloured bugs on either end of a gap. Afterall, contraction and combos make the game fun! Also, if you don't do it in all instances, it seems inconsistent. My subconscious asks, "Why do they contract here, but not there?" "Why did they contract just now, but not match!?" There didn't seem to be a pattern to this behaviour, so I assumed it was a bug.