Just some firm data about frame timings for Arcade Mode to make it more transparent. Marking the frame you press START on the splash screen as f0, the run starts from f+133. You can see Rifle's shadow appear at f+135, and on emu it disappears every other frame, so that you can always tie your start time to these points. Run ends when the final boss explosions animation stops/you lose control: marking the frame boss HP goes to 0 as f0, this is expressed as f+254.