I am Making a platform game with a stick-man as the main character but need a back-story and enemies

Green Blobs of Goo as enemys!!!

The stick-man discovers that his entire world is as big as a blade of grass once he drinks a potion that grows him to the size of a regular human. Now he has to explore this new world that we live in to find out how to shrink back down to be reunited with his family. Along the way he runs into all sorts of trouble including sprinklers that spray acid and flying machetes (or any kind of knife.) Why are there sprinklers that spray acid and flying machetes you ask? Because an evil scientist named Dr. Doo invented them of course!