You need to touch the square with your mouse pointer in order to make the square jump.
At the start you must stay in the air, throw the CE with left click on the first platform to make it BLACK.
After that, you need to land on a RED platform ( ie the second ) in order to be able to get back the CE and repeat.
You can use mouse wheel to zoom and anticipate new platforms
If a red platform collide with a static black wall you lost the game
Hope it helps, Good Luck