Do not focus on the coins. Concentrate on finding and ignoring the obstacles. You will collect enough coins incidentally while progressing.
Control
You have to tap quickly to score over 100 points. Each tap fills the time meter slightly. To keep it full you must tap very fast. Try to move your character to the other side as soon as it appears to be free of obstacles. However there will be times when there are obstacles in quick succession on both sides. When this happens, slow down slightly and choose your moves carefully.