YANK!

• A/D - Move left and right
• MOUSE - Aim the grappling hook
• LMB - Shoot the grappling hook
• SPACEBAR - charge the grappling hook, let go to to launch

You start at the bottom. The top is very far away. Your only tool is a grappling hook!
Mind your angles, power and make sure to use wall bounces to get to the top!