Experienced dataminers have found that the standard URL (usually snowrider3d.com ) has a shadow parameter. Try appending ?mode=exclusive&build=g to the end of the URL. While this doesn't always work due to server-side patches, it occasionally unlocks a "Beta Tester" skin.
Furthermore, developers frequently patch the backdoors. The "G Snow Rider Exclusive" you find today might be patched tomorrow. The hunt is part of the experience. Rumors are circulating in the dev logs that the success of the exclusive mod may lead to a paid "Season Pass" for the game. If that happens, features like God Mode will likely be nerfed, but the exclusive maps and sleds will become DLC. g snow rider exclusive
If you want to stop hitting trees and start dominating the slopes, stop playing the vanilla version. Use the methods described above, find the working access key, and download the modded assets. Experienced dataminers have found that the standard URL