This level isn't hard at all, it might be with lag though (I don't know). The trick is to push an ice block near the ceiling, and then jump through the ceiling when standing on the ice.
This level is far too laggy for me to finish with a good time. I also don't like levels that use hard-to-do glitches. This is the equivalent of JG2's headjump.
edit: Nvm, you mean something else.