btn = Button(window, text="kill", command=lambda: killhard(score,shoot,health,level))
health, score = killhard(score, shoot, health, level)
def qw():
global killhard(score, shoot, health, level), health, score
health, score = killhard(score, shoot, health, level)
Button(window, text="kill", command=qw).place(x=0,y=0) # сюда координаты кнопки