Hi,
I read your Project details where you stated an urgent need of ready to sale games.
I have recently finished a 3D FPS shooter game called The Demoman. In this game, the player uses Grenade Launchers and Rocket Launchers to defeat waves of Chasing Prop Enemies.
It is a Premium 3D Offline Single-Player game which can be downloaded and played on Windows, Mac and Linux. It is completed to the extent of instant sale.
It is made in Unity using C#..
You can ping me for more information about the game.
Thankyou.