Wait, you actually did run into Labyrinth? Huh. I wonder how that happened. Well, whatever, it's more "active" in the update. It took me forever to find what should have been a super obvious problem. This will also stop Invader from ruling floor 3 at all times.
Wall Launchers: They're on the list of "make changes, make variants", but I haven't done them yet. I agree in the current version you have they're much too weak. The purple stuff is the sort of thing that tends to SEEM dangerous at first, but after getting used to them, they're not even all that tough in rooms with other things around.