Use the space bar to jump off the ground, and then use the left and right arrow keys to negotiate the next landing. If done right, you can ‘hop' from one pacman to the next without falling to the ground.
The game is easy to pick up and play, and is therefore quick to gratify. And yet, each level requires you to get more pacmans in a shorter period of time, thereby providing the real challenge. The only complaint I have is the game lacks a scoring mechanism or any way to rank how well you did. Still, it's a simple and fun game concept with well-produced graphics, animation and sound.