Everyone clones. Look at FF8, etc, if you don't believe me. Card games where higher numbers win battles... that is in CCG/TCGs all over the place, as well as old domino and Rubix-type games (the FF8 "Same" rule especially) where you match numbers on cards or tiles....
There are games out there like YAAC (yet another Asteroids clone) and YATC (yet another Tetris clone) and such and people love these games. YAAC was always fun but it won't run on my WinME desktop.
