The problem I see with that one is that even on ITYTD, it is impossible to stop formers from grabbing the medkits. Perhaps the medkits could be stuffed into little closets. This makes it almost guaranteed that you'll get them, which helps balance the fact that everything will wander into the first room where the entrance is too narrow to sidestep in.
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Edit: Perhaps a way to keep the sergeant in the final room instead of wandering to the center would help balance the difficulty. Same goes for preventing going around the gate and hitting the second door on a diagonal, which is faster than a straight line through both doors. Plus it's too easy to corner shoot the UV/N! sergeant, at least too easy for also having guaranteed medkits.
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