Hmmm... needs more.
1) NEEDS MORE PARTS.
2) NEEDS MORE ROOM TO USE SAID PARTS
3) NEEDS MORE VARIATIONS OF PARTS (outfits, weapons, faces, muzzle-flash etc.)
4) Also, your cars come in two pieces, which is a little awkward.
5) NEEDS MORE MUSIC OPTIONS
Try having a whole bunch of soldier variants, like Madness 19th century army uniforms, WWI, WWII, etc. Just because they look cool.
Also, I absolutely love the inclusion of the new 45. ACP Submachinegun.
Get more imaginative- Fantasy swords would be epic, along with maybe some ultra-high-tech weapons. That or Covenant Plasma Rifles. Or both.
Try to make it that the items that go onto the background FIRST stay BEHIND the items that go onto the background AFTER. I can't make them dual-wield because the left hand weapon (when facing right) overlaps the right-hand weapon. (And vice-versa.)
Basically, fix a few bugs and the UPSCALE EVERYTHING!
*more weapons
*more outfits
*GIANTS
*more effects
*more music options
*more background options
more space
Try to make it that there is so MUCH stuff that you could never possibly cram it all on screen, unless you use a panel system that you click on a box on the side of the screen, it slides onto the screen to reveal everything in it's category, click the box again to close it, and have a box for everything (weapons, effects, outfits, corpses, etc.)
That's all I can think of for now. ~117