Personally I find Drox Operative to be quite original. There are already so many Fantasy themed Diablo-alikes and Zombie games on the market.
Any chance for a Drox 2 at some point in the future with upgraded graphics? (Zombasite does look pretty slick). A way to expand on Drox 1 could be adding a combination of spaceship and ground combat (boarding, on stations, on planets etc).