A Good Remix...
You made a nice remix of the Bowser battle in Super Mario World and in some points it was even better then the orginal one.
The Mario sprite is moving good and it can do all things as in smw like the duck-jump and the spin-jump on the flames.Bowser had the same collison as in smw,so for the programming you get all points.
The graphics were sprites of a snes game and they are overall easy to use,so I can't give you all points in graphic.
The music was good at the beginning but the loop annoyed me after a while.The sounds were taken from smw as well and they were fitting in the game well.I missed the sound of the flames but that's not a big point for me.
You showed that you can programm a jump 'n ' run like smw good but it was a bit too short.You know it was just the Bowser Fight which isn't that challenging or long at all.I think you could make a really good mario or any jump 'n' run game in flash and I hope you will keep on working on you're skills.
Overall I gave you a 7/10 and a 4/5 and I hope you'll make a good game like this again but only a bit longer.