Sure, the early game can be brutally difficult, and some may find that off-putting, but stick around past those early stages, and Super Bullet Break's moreish gacha systems will almost certainly suck you in, due to the way in which the randomized systems bring the creative options for deck building to the forefront.
In order for a missile to perforate the skin and enter the underlying subcutaneous tissue and muscle, a minimum velocity in the order of 70 meters/second (230 ft./second) is necessary with an energy/area of presentation of approximately 2.1 m-kg/cm2.