Pyromancer Firewall control is very weird in mouse mode where you have to click the individual tiles to make a specific pattern or else the walls just go in a straight line. This is less than desirable and would seem to be more intuitive to either have them be summoned via WASD keys or holding down the LMB and moving the cursor around to form the walls.
I’m not sure if Cryomancer has the same issues as Pyromancers do but if they do, this would be a nice addition.