This room is all about positioning and so has a rather elaborate setup, but little overhead during play. Player-characters have the upper hand on dry land but must risk entering the murky waters to reach their goal, and are forced apart by geography.
I know I should have had some ranged attacks to force the pcs to move, but i couldn’t find a solution that didn’t violate my aesthetics (bog mummies should have their bows and javelins rotted). If you don’t mind, you should totally add it.
design notes etc at my blog