6 frames faster than published. Player 2 jumps 1 time fewer and the improvement comes from more frequent hit registers (and destroying bullets faster to shoot the next ones earlier).
The movie started from a scratch but I heavily modified the authors' strategy at 1st "boss" (that tower with a man and vulnerable at bottom box thingy) however I wouldn't be as fast as this if I wouldn't analyze their effort.
Comparison of hits (this wip vs published run) from 3582th frame
XXXXX–XXXX–––––––––XX–X–XXXXXXXX–XXXXXXXXXXXX (5,4,2,1,8,12)
XX––––XX-X–––XX–XX–X--XXX-X--XXX-XXXXXXXXXXXXXXX (2,2,1,2,2,1,3,1,3,15)