Oh and because of the hitting itself: In Unity in the Settings under Physics you can toggle which layer should interact with each other. You could set player character and bullet on different layers and then untoggle the interactivity between Chicken-layer and Bullet-layer.
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That would be better implementation for the bullets maybe. So currently the bullet is a Box Collider 2D with a trigger
And the players and enemies inherit from a class called MovemementEntity. So when any bullet collides with a MovementEntity(enemy or player) then it causes damage to the entity. Probably some other implementation might be better. But right now the shooting itself needs to be fixed.
Thanks for playing the game again!!