Thanks for playing! Did you build the smallest possible towers? They should easily be able to target the smallets enemies, and I don't seem to be able to recreate your issue.
Yes if they go to the sides even just a little bit they don't seem to get detected at all. I used a row of each of the towers
Oh wait. Did you scale the towers? You can scale them with the scroll wheel. The default size ist too big for the small enemies.
Ah I did not, I did not discover that mechanic. Now I understand why was havig so much issue! Completely my fault haha.