Air Mail is great! I love it.
Also, decided to snag Mass Effect Infiltrator for $1. Thinking about Batman also. Is Mass Effect I pretty good? I know it's at least 5 hours long so I'm sure it'll be worth it. Don't know about Batman but for $1, I think it looks like it'll be fun.
Also, King of Fighters '12 is good as well.
My Mass Effect Infiltrator opinion has kind of changed now that I've played more of it. It seems to struggle from the same issue Dead Space iOS did by just having the entire game be repetitive combat rooms. It seems unnecessarily drawn out too. The core combat is good, but the game itself is falling short to me.
Mass Effect Infiltrator is waaaaay better than Dead Space in terms of gameplay. Its gameplay mechanics are absolutely excellent. Though in terms of levels it is somewhat simplistic and repetitive (though more varied than Dead Space) and in terms of story and story-telling it's a joke (which is sad since it's supposed to be Mass Effect). But if you really dig Mass Effect games' combat and you want something you can up your galactic readiness with on the go, this game is *awesome*. I'm having a lot of fun with the flow of the combat in this and I'm actually on my second playthrough. Dead Space, on the other hand, was never really engaging to me gameplay-wise.