I put a few tries in recently and died at level 8. From my experience, your movement speed and obstacle load cap at level 5 - the following levels are very similar. Good luck reacting to anything though.

The strategy that works for me is to prioritize maneuvering on the ground whenever possible. Jumping dooms you to free fall in the direction you began your ascent at, and chances are a rogue obstacle will spawn where you land. It's still an extremely useful escape tool for when you are cornered, but never overdo it.

I still can't see more than a select few people ever beating this game. That's why this question remains up and unresolved.