Here's a functioning concept for a map I plan to make.
I had to start late for the contest (2PM EST 7/24 is when I started) without any plans/layouts or design theorys... But I had the idea to make this game mode for a while (I know it will probably fail but it's worth a shot). So I did.
When I can, I'll hopefully add a good map design, layout, logic system etc along with upgrades.
Currently it's made for red side only and accepts bullets (not sentry's though), needlegun needles and melee attacks as a 'click'.