Great question! :D
My background is 10 years in enterprice programming, and I recently started learning game dev as a hobby. Before this, I had only played around with platforming mechanics. Without that background, it probably would've been imposssible for me to make it in just 2 days.
When the theme and object were revealed for the jam, I came up with this idea and decided to experiment with it. It was an iterative process with lots of trial and error. I spent around 2 days just working on the main machanic and 1 day on everything else :D. At first, it was much buggier, but step by step I fixed the issues and made it smoother to draw.
By the way, I already have a better version of drawing mechanic, but I don't want to update it until the voting period ends.
If you found it interesting, I might make a dev vlog or something with more technical details about how it works, since I couldn't find anything like that online. Anyway, I plan to keep working on it and see if people enjoy it.
Thanks for the comment and for playing!