This game is amazing.
Although, I see people asking how to beat levels and I see why.
Tips: If you're running and you create a Boxman, the Boxman will be running in that direction.
If you hold the down arrow key and create a Boxman, he'll be crouched.
Using a crouched Boxman, you can leapfrog another one over the first by running him towards the crouched one.
Experiment a bit and you'll have the game down easily.
5/5 =)