I think the menu was life-saving after encountering a bug that caused me to clip through blocks and soft-locking me. Other than that, I got to the part where you unlock the bigger jump with 21 gems collected, but got confused where to go and accidentally repeated the jetpack section, wanted to return back to the teleporter but had reverted all my progress.
I think at that point I've had my fill, this was an amazing difficult platformer despite me not having the willpower to finish it.