Thank you for the feedback! I'm genuinely so happy you liked it enough to play it twice. I'll try to keep this updated so your nitpick is noted for the next version.
To answer your question, I cheated a little and took a prototype of a platformer I did a while ago and put in some lore ideas from a different project to quickly come up with something interesting. I'm still pretty new to unity so having a big part of pogramming done already was a blessing. And working 12 hours each day. That also helped :')