Thanks for the advice. I know it needs some work so that's something I'll certainly consider (it is a bit eye bleedingly fast, and I actually slowed it down from the original) :D
Viewing post in Flight of the Elements (DEMO) comments
I don’t think speed is the root issue. It’s that the player might nit make it to the right height before the next obstacle arrives because of the position they started at. For example, the player could pass an obstacle that left them at the top of the level while the next obstacle needs them to be at the bottom.