A 2D game, during the second world war, where you and two other friends play as "The Alliance" to defend a base in the middle of the map from the enemies that comes from the left and right sides of the map. Defeat enemies and get points to repair the base if it has been damaged or purchase better wepons with limited ammo to easily dispatch hordes of enemies.
Here's a concept of how the character select could look like. An image of the character to play as and a small info box about the character.