This is a   Speed Doomer's Archive entry 

author:     Mike Toliver <miketol@mtco.com>

game:       Invaders.wad (plus invadgfx.wad for textures), DOOM2 version 1.9

category:   max           
            
level:      Map 05
            
stats:      Kills    104%
            Items    100%
            Secrets  100%   and Time   22:59

Comments:   I really like this wad.  The author uses heretic textures, which I think look very sharp, and the game play on all the maps (there are 6) is fantastic.  This map has some remote switches that require some back and forth over the same ground, but it doesn't hurt the game play much.