Here's my slow play:

Here's the TAS: http://tasvideos.org/2522S.html

My notes so far: Death comes quickly, and losing your power ups adds insult to injury. Oddly enough, the stronger bosses aren't that much harder... except the final boss (OHKO plus faster boss magic). The levels are the hardest part... the patterns are more dense and have harder and hardier enemies.

Faster...