Hey Wiz, I downloaded your game and I think I can help some. First off, I just wanted to say that your game is pretty good. I also think that your game would be better orientated as something like this;
scirra.com/tutorials/37/beginners-guide-to-construct-2/page-2
(sorry, you're going to have to manually put that into your address bar)
Where the player sees the player from a top view. If you follow that tutorial, you should start to understand why the bullets only go one way. Hope that helped. Also, your collisions with the pillars is off because you didn't erase all of the image that you didn't want. If you get rid of that and crop the image again, your player should not collide with it until he's actually touching the pillar. ;) Hope I helped you a little.