I'm current'y designing a level that's a combination of robbery, base construction, and CTF.

You start in your base, and have to get around through the back windows of you and the other teams' base to steal the flag and money. You can then score a point and, wwith the money you stole, buy upgrades for your base OR speed up your capture time by launching yourself through a cannon into the room above the other team's flag, but you can only use your cannon, and only one time per purchase, so you still have to run through the other teams' base to get back. The more coins you steal, the better upgrades you can get, like opening a weapon trench for just your team, and closing 2 of the 3 back windows.

Most of the idea is already in operation, but I still have to deal with some annoying trigger glitches.