I'd recommend rebel for 2 dollars. I haven't bought it personally but i've read on other boards that people were having fun with it so i don't think you could really go wrong there. Have fun with whatever you choose. 'A Space Shooter for 2 Bucks' is also a fan favorite (i have this one and it's actually pretty good).
I heard from someone that Jetpack Joyride should also come out tomorrow but i can't confirm that at the moment plus i have no idea what it would cost.
i'm typing on my vita so my grammar is horrible.
Studies show it is humanly impossible to play through all online content in LittleBigPlanet in a single lifetime on Earth.
Don't Forget to Play [Persona 4 Golden] Every Night Before Bed.