Hi, I'm glad for your interest in the game. You may find useful advice in this Hearstone support thread, as both Fragments of Euclid and Hearstone use Unity.
They talk about the pink screen issue, how you can try to update your graphic drivers, and at the very end on the second page, several people mention downloading a file d3d9.dll has solved their issues.
I hope you will be able to play and enjoy the game, let me know if it has worked. And don't worry about the money, donation is totally optional.