Hello again !!
Just found something awesome on FB !
A comic artist named : Abel Alves and living in spain made a 40k game alone with Arcade Game Studio (old school style game maker)
Ultramarine the Retro Game is a freeware classic 16 bit videogame inspired by the world of Warhammer 40K.
In this game you will play with Darius, a brave Ultramarine, fighting against different enemies through the Warhammer 40K universe; using different weapons and habilities.
Download the game here : http://www.mediafire.com/file/71bni7r1tpy42px/ultramarine.zip
His homepage : http://www.comicsabelalves.com
Still a better game than DOW III !