Excellent job with this!  Not to discredit your earlier work, but you've been churning out a lot of really exceptional stuff recently, and just wanted to say your work is appreciated. In my experience, it's difficult to find free, quality First-Person assets or 8-directional sprites (isometric or otherwise) like your sci-fi trooper or ghoul. 

If you didn't mind sharing, what program(s) do you use to draw/animate your projects?