This is a very simple level, where the only major thing that matters is how fast you do the shooting section on top of the train before the ship fight. In this run I got an pretty much perfect fight before the boss, so I'm very happy with this time. Though the start inside the train could've been a little better, since the enemies blocked me a bit.

Also, in my testing using Dart Overlay with the +25% damage chip upgrade didn't make the boss fight faster, so it seems to be capped for how fast you can destroy it.