I was searching for old games that I use to play and came across Impossible Mission!
I think those robots from IM1 would be a perfect addition to OXC. If someone could code a random color scheme for the bots when they appear, the electric bolts they shoot, and the electric properties the bots themselves have (and sounds of course), I think that would be cool for OXC. Maybe change things ever so slightly to keep it more in balance with OXC.
And maybe if the soldiers could turn into a pile of dust when killed...!
Maybe call them Death Bots or Electro Bots.