Well, I started this game at 8:00 this evening, and with the help of a friend, it is playable within time for the submission. (Actually, it could have been more done, but we had some fun doing other stuff).
So here is drone massacre. The aim is to shoot down quad-copters as they fly overhead. It was going to be scored, but I didn’t get around to implementing that. Nor did I add a mouselook cap (oops).
But here you go, the three hour game:
Drone Massacre V1.blend (710 KB)
I may well develop this further, I think it could be quite a cool game if things like combos, different vehicles, powerups etc. were introduced (and a menu), but none of those would fit within the 250 poly limit.