The red zone is generally where i try to line up my bomb
for the pod insta-kill
for the final speedkill you dont need to do this
just open fire and sit on top of the boss.
Wait until timer is around 28 or 27 left
or else you risk time bonus not expiring
before the final cube drops off the screen
which will give you negative points
The bomb works in a spiral starting from top left of ship and bottom right. its not a square hurtbox.