Time Gate has been overhauled. The game mode looks better, plays better, and the rules are obvious without tutorials. Go through the new time gate and the road will build in front of you. Overshooting the gate means there's nothing for you to land on, making the mode less confusing.
As previously noted, the leaderboards for Time Gate have been reset because of the gameplay changes, so now's your chance to get a good position!
See the full release notes here.