I'm happy I got the opportunity to play it, and offer any help that I'm able to! I'm really excited to hear your plans to continue development, because you've got a really solid baseline going. I would absolutely buy and play whatever this might transform into if it ever got published.
I think I finally figured out how to consistently cause it! If you apply your jets with a greater falling speed than your jet acceleration can overcome such that your jets are still running as you hit the ground, your next jump applies the jet's acceleration to your regular jump! Not sure if you knew already, but I was excited I could finally reproduce it.