Wave number should increase >_< quality selection
well,nothing much to say about this game(i mean from disadvantages)
but for some computer(mine's too :P) the game might be very troublesome,when you hold the left key to move,because the "lagging" when u stop pressing left it still move toward left,which cause to sudden death when u try to move to another direction, so perhaps can add a quality setting :D
and for the wave numbers, every map has only 4 to 5 waves,it is boring to play at the beginning of the game because there is only a few zombie come at you,and all you have to do is move the mouse around and shoot only,lacking the challenging and exciting feeling at the beginning,and with such low number of waves you have to replay the boring part every few minutes,reduce the replaybility of the game