The game was actually quite impressive, at least better than I expected. The first thing that impressed me was the slick looking loading-page. It was bland, but still quite impressive. The control page was perhaps a bit too bland, but you can't really have too many complaints about it, it was pretty decent and covered everything.
The game-play had some pretty nice graphics, you did a good job on the pixel-art.
Now here's where the criticism kicks in; first of all, the pause button didn't work, even though it was nice enough to stop your movements, it didn't stop the enemy-shuttles in any way. Which is double bad for you. Second of all, at the moment, the game is pretty much spamming bullets, it'd be better in my opinion if you had more time between the shots, but with an increased damage. Further did some of the stars look way too much like bullets, or vice versa. I'd recommend to change the bullets from your ship into something more green and the hostile bullets to be red. This way there's an obvious color-scheme.
Lastly, the planets really look like they interactive, so here I was shooting at something in the background, perhaps you should blend it with the background more.
That's about it, so far, it was a pretty good game, I'm looking forward to more updates and will keep an eye on this thread.