FPS in Blender

Hi everyone, I’ve been working on a little project that I started a few days ago, this one being a FPS. You can currently move boxes, fire your gun, and look around.
It is in a ‘developement’ stage, and I plan to add many more things.
Stuff I plan to add:
Add enemies,
fix collision errors, such as bouncing off walls, and looking up then turning left, going sideways,
add doors,
and more.
Here are a few screenshots:
Comments welcome!

Note: I borrowed the textures from a game for it.