You nailed it, having played a million games that only play from left to right (and having made one myself a few years back) it never occurred to me that I could go the other way too. I played your game again and got to the end this time. I'm still impressed. :)
I also understand what you're saying about game jams. Believe it or not, this was my first ever game jam, which is quite the "achievement" considering that I'm 43 and I actually made my first game 35 years ago - on a system that had a 2.5 MHz CPU and 16K RAM... The final entry I submitted is barely a shadow of what my original idea was; life got in the way and I lost 3 days, leaving me with a whole bunch of half-baked features. I basically spent all of Sunday cutting stuff from the game, just so that I actually have something to submit that more or less works.