There's currently the following deal: we can pre-order this game for 1$. If there is more than 10M pre-orders, we get the game and its soundtracks, else we don't, the 1$ goes for charity, but we will be discounted 1$ off the game price if we want to buy it nontheless.
The developper explains it there:
And here is the game site where we can pre-order:
http://afterfall-universe.com/
I don't believe we will make 10M pre-orders however, although the game looks quite good.
