Thanks mniip.
So. Ethics.
Its unethical to sell this if you literally didnt do much other than make it run. if you really wanted to sell this and make money ethically, you should do something like make the gui touch friendly or something. Right now its such a pain in the ass to pick crap, plus some of the walls are inexcessible, bought it, refunded.
Also fix your simulation dimensions so you can load saves :l seriously.
That, and also it says im getting 50-60fps but it looks more like 4 or 5 on my nexus 7
Maybe that's the source code of The Powder Toy, but I've checked it and giving away some unsorted code that we have to manually sort, move and discover what to do is not GPL-compliant as mnipp said...
I'm going to contact Google Play to warn that you are breaking public licenses to make money, maybe we are lucky and you get your Google Play account cancelled.
EDIT: If you want to contribute: https://support.google.com/googleplay/android-developer/contact/takedown?hl=en
I was going to buy your app as a "donation" like you say, but watching how you are doing this (The bad way, is obvious that you are obfuscating how to get source code and compile it to make money with other people's work), I'm not going to do so.
Apparently he moved it to https://play.google.com/store/apps/details?id=com.cannonball.thepowdertoy
Link updated in first post.