3D First Person Shooter

I plan on modifying my final 3DFPS game by creating a level with a very different look to it compared to our tutorial. I plan to use the same enemy, player, and decor but will make sure my overall environment correlates in a way that makes sense to the story of the game while also being very different. I also would like to add more obstacles to my game to increase difficulty and make it more interesting, maybe a little scary at times as well. I will also change the out-of-game menus and victory screen to match the theme of my new game.