thanks for the feedback I have a version with a couple of extra abilities such as being able to grab groups enemies and throw them for a short time as well as one for a massive arm that you could sweep from the base of the wall to hit things for some time but would also destroy structures. (will add after jam is over, may also include other features)
the problem with being able to clog the entrance was pretty apparent in testing but some idea were having some enemies that could jump obstacles as well as some that would walk over them, climb down interior walls or even blow walls up to make new entrances for more basic enemy swarms. (also possibly just not letting the player place walls down the corridor or near the entrance)
For the maze idea I might try mess around with it in a few ways like the player placing meat walls between 2 points that people can destroy, just preset mazes for some maps, or some enemy types that can create walls to defend from your attacks (or a combination of all.