Changed payment type from Free to Pay what you want to support development

As you may notice we have changed the payment type on Strobophagia from being an exclusively free download to a Pay What You Want. 
The reason behind this is easy. We at Green Tile Digital want to make and release the best game we can, but our financial reality is sadly that we do not have the funds to keep going forever or to acquire the needed assets and tools to shorten our development time.

In short, a contribution to our alpha here may not buy you the full game outright (depending on the sum), but it will help secure its timely and stable release.