The game looks sharp and really clever, but, on the level 2, when I shot the walls, this happen:
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FATAL ERROR in
action number 1
of Step Event0
for object obj_clone_gun:
Unable to find any instance for object index '0' name 'obj_player2'
at gml_Object_obj_clone_gun_Step_0
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stack frame is
gml_Object_obj_clone_gun_Step_0 (line -1)