well make some mini helicopter that u can control like a spydrone shoot it fly it and then u can fire asault rifle shoots whit it and drop bombs weaker then lams. would be cool if u made it
try a turret that shoots a wide variety of different ammo,
EDIT: Ok, I want u to get a map, thats quite original quite simple,(one youve already made) and put a twist in it. An extra room with a lockdown format and stuff.
if you can experiment with a gun that when you bring it out, it halts your movement pretty much completely, and then when you pack it up, you can resume moving