Not moving and shooting is a very good mechanic, I was surprised how much it added to the game. However I only really enjoy it when it is a one on one with a gun zombie. Otherwise you just have to kite the same as normal shooters just stopping in between.
Speaking of which, the moving faster diagonally kind of messes with the game as you have to always run into the corners to get any space between you and opponents.
I am not saying this because I think it is a bad game I just want to give honest feedback for you to think about if you take this further.
I would recommend.