An FPS game in which a team of players has the first 10 minutes of a match to design and build a massive vehicle (battleship, giant tank, mecha, airship, etc.) that takes multiple people to operate, then pits their creation against that of the other team. Each player only has so many points that they can contribute to adding a weapon or ability to the team's vehicle, so multiple players have to agree to pool their resources to get giant death rays, and at the expense of point defenses, fighter bays, medical facilities, etc.
Ammunition has physical presence and is volatile. That scene in one of the Matrix films where the ammunition starts cooking off and kills half the crew, that can actually happen. In addition to that, the giant artillery can fail to load ammunition, requiring an engineer to run in and fix the issue before the weapon can fire again.
Players gain currency for kills, so engineers can continue improving and adding to the ship as long as hardpoints are available. Eventually, both teams gain access to jetpacks, boarding craft and teleporters, allowing them to go on the offensive and start damaging the enemy craft from inside. Whoever loses their craft first loses the match.