In this game, you must avoid the various types of shapes while trying to use your shot to bump these shapes into the four fangs of death on the 4 sides of the playing area. You cannot move outside the red-lined area. Shapes, when they initially spawn also cannot move outside this area. After they get shot, they turn purple and can leave the red-lined area, bump into the fangs of death, and die. The angle you shoot them from will effect how they move afterwards so auto-fire is not recommended.
There are 12 achievements, most of which are incredibly hard. But to me, for it to be an achievement, it must be hard, otherwise you didn’t actually achieve anything.