The mechanic in question is 'ye olde' walk through one side of the screen and come out at the other. The same kind of thing done in the original Mario Bros. game. Warp Game, however, uses it to set up increasingly elaborate platforming puzzles, which turns out to be quite a bit of fun.
There are some moment where precise platforming becomes more than a little frustrating, but on the whole I really enjoyed this innovative little platformer.
Warp Game [Kongregate]