The art felt very well integrated! Gotta outrun all those spooky aliens.
Apart from what others have said about not having to fire the gun, I actually wanted to! But I thought that 4 shots to kill an alien was a pretty big deterrent to even bothering. I think maybe 2 shots, or 1 if you hit the head (each alien could have two collision boxes for the detection), could make firing the gun a lot more satisfying!