Indeed. I can without hyperbole say that i've made hundreds of custom guns, dozens of bombs and a handful of usable actors. So yes, some of the sprites in here do indeed come from Cortex Command.
AHEM, gem launcher, you say? That's actually kind of a funny idea. Or maybe a GEM RAIN FROM ABOVE, so people will stand underneath, hoping for infinite wealth, and erroneously assuming that their skulls won't explode when struck by a huge gem moving at terminal velocity.
I don't even know why i'm throwing out teasers about it. Possibly because it's one of the very few large full-body images of anything i've made.