Thanks for the feedback! I'm sorry the chain reaction mechanic wasn't made clear, I'll expand on it a bit:
You must chain together successful obstacle avoidance (jumping and sliding) as well as the speed boosts in order to get into a favorable position to win the race. If you chain just avoiding the obstacles with no speed boosts, you lose. Vice versa, if you blindly get every speed boost and end up so far on the right of the screen, you have less time to react and thus also lose. So you're essentially chaining together 2 different elements of individual chain reactions!