Thank you, thank you for your feedback! It's given me some reassurance that I'm doing a good job 🙂! I guess long responses can't be avoided 😖.
With that being said, I totally agree you that visuals would take a load off the doc and make understanding some sections much easier. That was the plan for the game loop, and especially for the Look & Feel section since the visuals and audio are the most notable parts of the game's presentation. All I could do was throw the words in without eliminating the major sections so I could get my point across. 48 hours was a massive crunch on top of work. I only had a fraction of time compared to what was actually given. Thankfully, I had a headstart working on the GDD in preparation for the jam. It wasn't going to match the theme but my hard work wasn't going to waste!
Writing is my strong suit, so trying to convey how gameplay would function was the biggest challenge. Once it was put to paper, I even started questioning how some things would work, which just gave me an even bigger headache 😞. It was really just a matter of making sure everything made sense.
I'd be happy to answer your question about Aiko! As for why she can fly and rollerblade... For starters, it is mentioned in the doc as one of the abilities she gains when she ascended. Gameplay-wise, it's used as a means to reach platforms or areas that are out of range just by jumping alone. Or she could cover more ground faster than on foot in a stage, once you get the right ability. You could even say there's a thematic purpose for Aiko's flight, that being soaring to new heights.
Finally, the rollerblades let Aiko move swiftly if she's moving on foot in a stage so player can complete it quickly. The choice to give Aiko rollerblades was moreso done for artistic reasons so it'd be in line with the game's aesthetic. You could easily compare her to Shadow The Hedgehog 😆. As for the in-universe reason why Aiko wears rollerblades in the first place: I never thought that much about it, but I'll just assume she got them when she ascended since she already has them on when she reaches Earth.