I bought the digital download of this game.

Sam's journey might be the best platform game for commodore 64 so far. Graphics, playability and music is mind-blowing. And it has a great replay value. Buy this!

It's worth to mention that the crt file (gmod2) is currently unsupported by Kung Fu Flash. You can run the crt file for the64 mini, but you will have no save. 

Developers, please consider to update the crt file for use with Kung Fu Flash.