Actual SWF is at https://www.ockamrazor.com/Transfert/Constant/flash/baronSamedi.swf - but it doesn't load because of some HTTPS security (basically CORS.) Plus there's no way to tell if it's actually loading something in the preloader.
Anyway, I feel the bosses are a bit too passive - they move slowly and were easily taken out by just a few shots from Devil (no-damage but poisons), and simply waiting for them to die. Enemies seemed to get slightly more aggressive at stage 6, but not enough to hold attention.