Navigate across the elevators to collect stars.
Right Arrow/Click on the right side of the screen to jump right.
Left Arrow/Click on the left side to go left. But be warned, you only get to backup (go left) so many times, making it more difficult. Collect backup stars to gain more steps backward. Yellow stars are worth one point, but blue are worth two and red are worth three. More rare are suns and moons, which are worth 10.
Avoid hammers, which will remove a point and cause you to start over. Fire does the same thing. Check if there's fire below, if not, then you can jump down and loop around to the top.
Negative comments in the reviews will be used to make the game better. That's not a path to winning.