2D RPG Pitch

For the 2D RPG pitch I want to do a game that changes the environment to a desert or trailer park and change the enemies to some zombies or aliens. I wanted to change the weapons to more modern weaponry such as a crowbar, grenade, rifles and a sandwich to regenerate her/his health. The storyline is more of a survival and gathering resources. The enemies would be somewhat varied, ones would take more damage to be destroyed. The dialogue in the game would hint towards either survivors or resources you should gather throughout the story. The game could end once you complete all side missions and collect all survivors.  

I want this game to be a lot more than what you do in the starter kit and I hope I can accomplish that by making a lot of areas which you can explore. I want there to be a lot of enemies but I need to fin a balance between that so it doesn't become too overwhelming for the player. These are thing I hope I can be a able to do but it will be interesting how I need to compromise certain ideas.