So in this lab you would only be able to use melee and creepy crawlers. No grenades, because then it would defeat the purpose of creepy crawlers. The creepy crawlers could be a kickback with a 1-3 medal cost in this lab, so that way no one is always being the creepy crawlers. Since you can't throw grenades, the best thing to do is run and get to higher ground where the spiders can't reach you.
Fun? I think so.