Description: A competitive space invaders like game.
Instructions: Mouse cursor works only if its enabled from the settings.
Right : right arrow, D, mouse cursor
Left : left arrow, A, mouse cursor
Shoot : Space, Z, X, C, mouse click
Pause : P
In brutal difficulty life loss is permanent to the next levels.
Accuracy bonus is calculated from the score multiplied by the accuracy ratio.
Life bonus is dependant to the difficulty of the level.
