Interesting game mechanics! Took me a bit to figure out how to "properly" use the humans (trying to avoid spoilers.) I think i found a bug on level 5 the creatures wouldn't cross the bridge so i was stuck.
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Thanks!
I can't quite remember which level was level 5, but it is a bit hard to pass the monsters through those bridges, I couldn't think of another way of making those while still making it seem like without the bridges they'd fall (I couldn't just make the gap wider and leave a blank space, they'd "fall to the void"). It's hard, you just have to scare them and try to get them to go 1 by 1.