Changes: Made some attacks shorter. Added 4 more attacks! Added a gaster blaster custom block! Added a no-hit mode! Activate it by pressing space when you click the flag. 7/19/19: Made Bullet Board nicer, added 11th to 13th attacks 7/20/19 Changed music, removed no-hit mode, and made first attack shorter, and edited health display. 7/21/19 Added Pie. (press z to use)
The box shaking when the gaster blaster shoots is a reference to loganvcairn's underswap papyrus battle. (I will add changes to make this the full ver.)