new cool TD ideas

im makin this TD where i go play any TD i can find that has an innovative
function, and add it to mine. this TD is really customizable with everything that i can think of. The terrain is in versitile segments (like LIne tower) so it can be team or survivor. I built this from the ground up (i didnt just jack wintermaul codes and/or terrain like the people responsobile for all those shit ___maul maps). This also has my own ideas too, like random levels, so u dont know if its gonna be flyin or not.
Anyway its far from done basicly it has a few modes 15 0r so levels, and a 80% done race. I wanna know if anyone has cool mode ideas.

Free for all mode. Units just keeps spawning out of a point, and attack a point until a time runs out. The player with the most gold wins.

i thought of something like that called massacre mode, ill add your version too