I'll focus on improving the tutorial for the next update. The new features (Burst, Momentum and Coins) will get improved visual clarity for when the action is taken. In the current iteration, Momentum is increased when you press or release. If the diamond is above the 50% section in the line it'll start to deaccelerate, and vice versa for the other direction. Collecting Stars now places your diamond at the opposite end of the screen, allowing you to continue holding/releasing to get the most value out of your increased speed.