Found that using slide to reset your ability to fire is faster than holding the button. Beats the first boss by ~400 frames compared to last time.
saved 24 frames in the first stage via new trick. Using the old movie file, that's why the rerecords are so high.
Finished the game, there are some sloppy moments for this test run, including a couple missed shots on the final boss that would be fixed if I ever did a final version.