It looks good, for a first build. (If this is your first.) I can only make a few suggestions. One is like the others said, the walls don't need to be made entirely of 1x5 bricks, you should try some of the longer walls. Second of all, the room with the weapons. Try putting them on more interesting looking stands, instead of just 1x1 bricks. And sort them out a bit, too. Like Guns, futaristic guns, others, just some different categories. And the player type changer, that could be more creative, too. Like having people step into a room with the floor evented as On Player Touch > Player > Change Data Block, and maybe some emitters too, to give it a more interesting feel. And with the vehicle room, it looks a bit crowded, space it out a bit. Like maybe put the plane on a flat part of the roof, on a runway, to give the other two vehicles some room.
It has potential, it seems like you probably haven't been building for very long. Just try to be a bit more creative with your build! I'm sure you can improve it.
