The game's mechanic is simple and well executed. For what it is, it's built well. The visuals can be confusing at times and the difficulty arc is sprinkled with a few aberrations. What this game lacks is substance. There is no incentive play at all.
Scoregasm is a good shmup with an oustanding control system and a fantastic level design. If you own a joypad and you are not interested in great longevity or graphics, then purchase it without any doubt.