It's more than just a play on words. It's a fully procedurally generated game. (And a demake of Canabalt!)
Now for those of you who don't know what procedural generation is, you may have seen it before. Procedural generation is basically when a game doesn't have something (generally levels) predefined and instead lets the program randomly generate that "something", so that each time you play that part of the game it'll be different. (For a more detailed/clear explanation click this.)
For instance in Canabalt you start in the same environment every time, but after exiting the first building, everything is procedurally generated to insure that the player will experience something different every time. If you're a developer this is definitely something you may want to look into! It'll add great replay value to any game if it's done well!
[EDIT By Electron] I took the liberty of adding some screenshots for W!TSi xD