Meet Jose = you are invited or encouraged to meet Jose. Jose getroffen seems an incomplete sentence implying you have met Jose
'are redefined' - implying what you are about to see HAS given a new definition or meaning to sliding puzzles. 'müssen neu definiert werden' - it is necessary for some reason to redefine them, but this has not been dome yet.
As always, I am not very sure of my German but I think these two are important differences between the original and the translation.
Yes the second sentence actually means that my game redefines the whole concept of "Sliding-Block Puzzle Games".
"Sliding-Blocks" is a genre of puzzle games.