Pete, from OneMoreLevel, adds several interactive elements to the mix that actually serve to create an entirely different experience. It's more like Line Rider meets Teagames' BMX series, the result of which is a create-your-own-level style of game.
Using the palette of drawing tools, create a series of lines, ramps and jumps for the bike to maneuver over. Control the rider by pressing [Up] to move forward, [X] to change direction, and [Left] and [Right] to lean. You can also place collectible stars around your level.
Another nice touch is the ability to share levels, which is as easy as copying and pasting a line of text into the comments here, or your favorite forum. OneMoreLevel even has its own forum where you can find others to share levels with. Interestingly, there doesn't seem to be any divide between editing and playing your level and it is possible to add and edit lines even while riding! Unfortunately, creating visually appealing levels is more difficult than in the original Line Rider, as Free Rider doesn't have a background line tool, or a pencil or brush with which to draw curves. In addition, your rider's new found interactivity can be seen as a blessing or a curse. Maneuvering is unforgiving, and the defining aspect of the original Line Rider, that Goldberg-esque sensation of watching the rider move inevitably through your elaborate creation, is all but lost.
Free Rider is well worth a look, regardless of your opinion of the original, and should go a long way towards helping fans wait for the upcoming Wii and DS releases of Line Rider. Feel free to post your levels in the comments section.