Thank you so much!
For the art, I mostly used free assets I found around the web. I made a few small assets myself, but only a tiny amount. The music and sound effects, though, are all my friend's work—he did an awesome job.
As for the game itself, I'd already been working on an unfinished Metroidvania that was meant to be a reinterpretation of Lux Ultima, a game I made for another game jam (you should give it a try, by the way! 😄). Because of that project, I already knew exactly what I wanted to make and what I could realistically finish within the jam's time limit.
It really felt like a race against the clock, but I'm so glad you enjoyed it!