Yeah, sorry; In general, the ant and your swarm 'overlaps' other insects until they die. However, I sort've just realized this never got relayed or signposted at all. The little circle is supposed to show that damage was done. The collision for is a bit weird and a little inaccurate for clicking, but you can make your swarm (including your ant) go faster and your swarm will hone in on the closest enemies. If I get back to this, I'll try to make them more responsive. And definitely make sure all the mechanics are explained because that was a complete mess on my part.
Thanks for the feedback.