Alright, I seem to need 4 mimics, but I have 3. To recap:
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×I need one to finish the roaches left behind at first, one to drop some of the next trapdoors, one to kill the eye, and one to kill the brains.
The only way I might use one for two tasks is to have the one which kills the eye go all the way through the other sections to the roaches, which seems unfeasible.
I can get the eye without a mimic if I'm visible, but I seem to need to be visible at the serpent-tar section also.
Furthermore, I can't pass the section before the eye while invisible, and I can't pass the serpent-tar section.
This room is a prime example of why I subscribe to the one-puzzle-per-room paradigm.
You know what, I think I wouldn't mind a demo.
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DROD has some really great music.
Make your pressure plates 3.0 style!
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