Umm.. I noticed that you'd had a public beta in the Architecture forum, but you didn't wait for very long before releasing your hold.
Next time, I'd wait until several people have had time to play the hold before releasing it. That way, you'll give people more time to find trivial solutions and bugs.
I've found a trivial solution in L1 3S 1E, for you don't need any mimics to survive the hordes, as the pits you generate will block attack if you get behind them, and you also...
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×...cannot return to the central area to drop the trapdoors after visiting the secret room nearby.
So far, it's an okay hold; not particularly challenging or innovative, but reasonable.
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Resident Medic/Mycologist