I liked where you were going with this.  I didn't have anyone to try the game with me, so I didn't get to "play" as intended.  The characters would run into the sticks and would lock up and one character moving would move the other one.  My recommendation would be to look at not having a collision that would interact with the zombie character.  When the attack button is pressed enable a hitbox that would hurt the zombie character.  For the hockey puck, look at doing some kind of lerp to slow down and when getting hit by the hockey stick, add some velocity to the puck and then the lerp should reduce the movement very slowly so that it'll be like it's gliding on ice.