Not sure if you talk about "Time" mode left, or "Long" mode right. Left is the finish line (step nr. 50), tap anywhere to get to the goal - can't go any further in this mode. Righ is a chekpoint, tap the gray tile, you get +10 seconds on the time.
2 new game modes added for a total of 7 game modes. One of the new modes have left/right moving dark tiles (see image).
The game now has 70K downloads and 1500 US reviews.