Very useful, can be used to miss one shot between levels 5-10 on 50 stamps and three shots between levels 5-30 on 100 stamps.

The explanation for why this happen is: Basically the way the stamp works is that it goes for how many times you have shot. When you shoot during a tutorial screen, that amount doesn't change, so what you can do is transition after shooting to get that shot on the level after it, using it to shoot something. Since the shot was originally done in a tutorial screen, your shot counter doesn't go up and the game thinks you still have one more shot to go before screwing up the stamp, doing that on all tutorial screens renders you up to three shots throughout the run.

The exact transition shots used during this run are the following: The tutorial screens before levels 7, 11 and 16. To get them, you just need to shoot in the correct spot and press enter so that you start the next level. The video shows all the three places, even though you might not notice me doing them before levels 7 and 16 because I mash Space then Enter very quickly. For levels 7 and 16, you just need to position yourself correctly and mash it, but on level 11 you need to wait your shot to travel a bit, and be aligned with where the ship would be.