I know the leviathans can be any length but can they still be a single square? I've been stuck on level 7 now for a little bit and can find all of the sperm like monsters, except if they occupy 2 squares or a single square from level 7 onward. Anyone got any info on these wigglers??

I'm not sure of the smallest monster, but I noticed today that the bottom rows are cut off. I believe two rows are cut off on chapter 9. I thought there was a two-space monster, but I believe it was larger and the rows weren't accessible.

if you zoom the page out you'll see the entire board