Neat. Really neat.
I liked the alternate ending better than the regular ending... only because the alternate is his own fault while the normal ending is like a last laugh thing, which although done well, just didn't catch me as all that funny.
The fight was decent, especially for using mostly 8-Bit graphics, though the drawn in parts would have been tons better if you had done them in 8-Bit as well.
Overall, good. Keep it up. Do more. Get better. :)