It took me a really long time to complete my first loop. I died so many times at those pendulums, and when I finally made it past them I ran off the cliff where the track splits and narrows -- I almost gave up right there. But I'm glad that I didn't, because once I had previous versions of myself to mess with I started to have a lot of fun! It became a game just to figure out how to knock my old selves off of the track without wrecking my time or going off the track myself. I was thoroughly entertained when I noticed my purple self was consistently knocking out my green self for me, and slowing down in the process! This is the foundation of a very fun concept, I think you should keep on developing it. =)
Cheers!