Looked good for a wip. Keep up the work. Here I have made you something from my backyard to fix those green spots on the walls.
I do want to point out that you have a great idea, but you have some things that will need some work. Here is some c&c for you.
1. work on the animation of the player like jump, weapon selection and weapon usage.
2. Frames the frames were low
3. Direction not so much that you set the rail system up, but something to make the player say " I wonder what that was? "
Keep on creating and I hope this helps out.