I agree that the gun should be at an angle, otherwise I love it the design! The creature is awesome :) I love the message too.
I would prefer a different colour though, white makes it boring, and I don't wear pink!
I agree that the shirt's a little scene for my taste. That doesn't mean it won't do well! There's also something off about the position of the gun in relation to the position of the figure. I think part of it is that I don't like how strong the gun is, and how soft the figure is.
Also, the text on the gun doesn't really make sense to me since the gun's shooting out a heart. I think the design could be good but it definitely needs some work.