You're now Endzeit's new spriter, I thought I'd let you know
Seriously now, I really love those sprites, especially the monster, custom stuff like this show real sprting skills. I'd suggest, though, to have a stronger constrast going on there, pergaps you could do more highlights or shadows, or make the green darker and the red lighter/more saturated? I don't know, but it might work to give it a "deeper" look. ^^
Oh, and, would you by any chance consider really being a spriter for Endzeit? I think your style would fit and you'd get to sprite wierd mutants and giant machines