So, there you have it. I bought GC about a week before PJ-shooter (as it shall henceforth be named) was released, and I kind of regret it. Not that GC is a bad game, it's just damned tricky, and PJ-shooter seems a bit more accessible (the dudes on the Bombcast kind of said it was a bit too easy), and I don't really do all that well with really hard games.  
Anyone got any opinions on this? Too similar, or worth the bucks?

Though the games look similar, they have very distinct play-styles and represent different game genres. 
 
Pixeljunk Shooter: Artsy, stylish, puzzling shooter. More puzzle than shooter.  Fairly low-stress difficulty but great fluid dynamic, physics based environments.

Gravity Crash: Pure retro/remix of classic vector games like Asteroids, Lunar Lander, and Choplifter. All modernized. Its more focused on tight control of the ship and when played with classic controls, and manual shields, the game is quite challenging.  
  
Both are great IMO and at 10$ each, I got both and don't regret either. They are both very good games.
 
If you find GC difficult, you can make the shields automatic. This makes it more accessible without making it too easy.  But you go to go with the classic controls :)