For people having trouble...
The boss CANNOT DIE until he's done all his attacks. The game purposely wont let his health drop below a certain level on each of his stages to make sure he has enough time for his other attacks. If the boss's health isnt dropping, just stop shooting and concentrate on avoiding crap. When he's done his current animation you should be able to damage him again.
Author needs to learn about these new-fangled spell-checker things we have nowadays, and the controls need some work, but otherwise, this is some good, John-Woo style fun.
Not bad. Guys, I have no intention of buying the levels either, but rating it 1/5 just because it has the OPTION of buying some is stupid. It's not like they're holding a gun to your head and taking your wallet. Rate the free part!
To fly, find the "temple" with the sign about the sage getting flight. Sit on the stone for a minute or so.
Only after you have flight can you access the bridges, though you can unlock one beforehand. There's a lever on a ledge about halfway through the game that you cant get to by jumping, you can fly there now.