Super Blast 2 is out on iTunes, but if you want a slightly different version for free, then get the original. Super Blast costs nothing today, and you might like it!
Judging the game based on Super Blast 2, these titles are scrolling shooters that could be considered "okay" at best, but get away with simple gameplay and deaths that come from nowhere thanks to the visuals.
It really is a pretty game with a fantastic art style. Worth three minutes of your time, even if the gameplay ain't all that.
[Found a free App for iOS or Android? Think it's good? Hitting me up on Twitter is the fastest way to let me know about it. Please do so -- finding good free games is hard!]