Press the up arrow key to jump, don't touch the red. Use the mouse to destroy the wall. Use the down key to slide.
This took a couple hours. :P Going to add more soon. 0.0.4- Reduced jump time when player is going up. 0.0.3- Added an obstacle that you have to use the new "slide" ability to dodge. 0.0.2- Added a cracked box holding a normal box on a chain as an obstacle.