Mockup for a game

My "Group  Game Development Topics" class requires of every student to pitch a game that is to be considered for development by the class.

So far, I am currently working on the pitch for my untitled game. It is a first person horror game in which the protagonist is a mechanic for a spaceship that is infested with aliens that cause havoc on the ship's utilities. As the mechanic, the player travels through the dimly lit ship in an attempt to fix the failing parts and exterminate the galactic pests with only the aide of a flashlight and whatever tool they come across (hammer, blowtorch, etc.). The game Slender and the film Alien are just some of the influences for the concept.

I plan for it to be in 3D computer graphics, modeled and animated in Maya, with textures created in Photoshop. The game engine will most like be Unity.

For the mockup itself, I created it entirely out of 2-dimensional images in 2 steps:

1) I drew out the basic outlines of the walls and hands as separate Photoshop documents and I used photographs of metal as textures for the walls and floor.

2) I arranged the separate files in 3D space using After Effects and then created a spotlight, which I arranged on top of the layers.