BTW, there is a walkthrough on youtube for all the levels ...

On a side note, having the .deb on the repository has nothing to do with DRM and to force DRM for such a simple transaction is only going to be a pain in the *** for those who need access to an open device and actually want to pay for some game.

If this was going to be paid for, just remove it from the repo and make it downloadable from some other place after payment.