@Nick_EX: I managed to beat the last level you posted, and I noticed that the level relied heavily on jumping on spikes as well as jumping the correct amount.
Lol wow! I tried making a lvl on ther and it is kinda fun ;D Here is my first one, I'm calling it "BWAHAHAHA!"
I think I remember playing visible, and i can see where they thought it was a copy. however, I think it should be treated more like a genre than one game.