Yeah that one part is definitely challenging! You can just start walking off the platform and press W to start climbing, no need to jump! I saw multiple people trying to jump there which made it more difficult. I will definitely rethink that area, but I'm hoping to design more complex levels with my own 3D models as these ones were from the game jam bundle from GameDev.tv! I am only a developer/2D artist, but hoping to expand into the 3D world. :)