Level 5 walkthrough: Move the green guy to the right and get the jewel. Move the green guy 1 down, so the purple one goes 1 up. The get the green guy back to where it started, trapping the purple guy on his island. Get the green guy to the key. Move the purple key to his exit, and then the green one. It's simple, you just have to know the trick :)
May not have $$ to throw at you, but I'll credit you as much as possible! ;)