public void update(GameContainer gc, int delta) throws SlickException {
		super.update(gc, delta);
		if(collide("bullet", x, y) != null) {
			this.destroy();
			Explosions ex = new Explosions(x-80,y-70);
			ex.setGraphic(explosion);
			world.add(ex);
		} 
		if(collide("spaceship", x, y) != null) {
			this.destroy();
		}
		y += ((.1 * level) * delta);
		rotation += 1;
		this.setAngle(rotation);
		if(y > ME.world.getHeight()) {
			this.destroy();
			setDead(true);
		}
	}