Happy that you found it fun,
I will make game sounds better next time.
Thanks for playing my game, Im happy for the feedback,
btw the boss is killable
To kill the boss, you either have to shoot him 20 times or make him fall by going to the moving platform and allowing him to jump off (Avoid helicopter falling objects), it may be also possible to make him fall from the other edge.
It seems that I exaggerated in the health of the boss.