Shoot the incoming enemies as they get harder and harder. Dodge their fire or your weapons reset. 5 different weapon with 5 individual stages for each one will help you in this vertical scroll shoot em up.
Play with cursor Keys, Space to fire, Esc for Pause/Options and Help.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.