hp = 100

if hp < 0 {hp  = 0}
If hp = 0 {instance_destroy()}

hp -= 10

draw_sprite(сюда спрайт врага ,0,x,y)
Draw_healthbar(x-6,y-10,x+10,y-6,hp,c_black,c_red,c_green,0,0,1)

if hp <=0  instance_destroy()