Incredibly tough level. Somehow I missed the 173 that everyone is discussing, but I think that probably benefited me in the end, since I only ever spent brainpower thinking about the route that ended up being optimal. This was brutally hard to even touch the end on, definitely one of the hardest level completions I've done.
The 173 and the 163 are so funny. I totally know why people are stuck at 173 and ************************************************************************