This is another really nice game. It's not just eye candy, there's a solid retro endless runner/shooter underneath the PC quality graphics. It's also another release today that's incredibly fair with the IAPs - you can purchase Premium for $1.99 which gives you the ability to restart from checkpoints, utilize cloud saves and view statistics.
It's basically a light gun game with great physics that has you trying to get as far as you can by smashing obstacles and hitting bonus-awarding crystals. The nice touch is that your ammo is your life so missing and getting hit is incredibly painful.
It's impossible not to discuss the graphics though. The environments are a real treat, they're reminiscent of a few indie PC titles. There's a graphics quality slider too, which is really nice to see for those with older devices like me. The fact that I was playing on medium and thought it was already beautiful is pretty impressive!
Throw in Game Centre and achievements and it's a very easy recommend to make!