Honestly, I'm less annoyed at them trying to fake the LoLK extra stage, and more that they have too few bullets for an extra stage (or for that matter, an early normal mode stage, or late easy mode stage). Marisa's lasers have piercing attribute in the video, LoLK Marisa lost her piercing lasers various games ago by now. Also looks like they have enabled invincibility mode (the debug function).
3/10 not enough bullets, player still needs to git gud.