My first jam too.
Pros
I'm very glad I had done many tutos and little projects before, even never published and deleted since, because I already knew how to do everything I've done in the game. The development was kinda fluid.
The hardest part was to find simple to draw but nice graphics, but once I was satisfied with the style, it became easier.
I had doubts about the sound part, never tried before, but I've found a nice software and managed to do quick sounds. And found a free epic music for the boss fight.
I implemented most of the features I wanted.
Cons
In my timezone the jam started Friday morning and ended Monday morning. So I wish I had a day off Friday and Monday, I could have done so much more.
I wanted my boss fight more epic, but lack of time.
I wanted Katarina being an important NPC, but lack of time.
Conclusion
In the end I'm kinda satisfied with the result, I don't think I have any bug or glitch, and this is what i wanted: maybe less features than planned but they all work. Still I wish I had more time and I think I will make a "Definitive edition", just with two or three things added.