My sincere apologies for my previous rude comment. Honestly I was having a bad day, and I just wanted to come back and give some legitimate feedback for the OP.
Overall it seems like you've done a decent job eventing the game, and having it actually work. Now the good building skills come with time playing the game, but I recommend (as others have) that you don't use stacked bricks in the fashion you have. You can do that if it's part of the texture of the wall, so you might add 1x1x5 pillars every so often in the wall. Otherwise, stagger the bricks to look like a real wall would, or use the taller bricks (1x5x1, 1x5x2, 1x5x4, etc...) so it doesn't look quite so spammy.
I also recommend using more varying colors. The blood looks alright, but instead of just a grey floor, grey walls, and grey ceiling, add a different textured look to the floor with those handy print plates.
Finally: nice job with most of this, you just need time to improve building skills, but good work with most.
FAKEEDIT: Add some "furniture" to the inside. It's just empty right now...don't you think a survival bunker would have shelves, crates, broken stuff, etc...? Just a thought.
