Made a concept sorta thing
Panting and Camera Shake Simulator 2014
This is achievable, just edit the freaking OP mod that's the closest thing to this: The Renderman Mod. Btw, please make this one killable. The Renderman Mod is something I shot a trillion times AND HE WILL NOT DIE.
Then explain the Mini-Nuke. It's a edit of the default Rocket Launcher, in a different form, and with an edited missile.
We could make an entire assortment of monsters stuffed into a single game mode like the renderman, this guy, and some other creative horrors with each of them attacking either at the same time, or follow up one-another