We've been working on it for full 8 days! In fact the project was quite a bit undercooked by the original deadline, so I was really happy to see the one day extension announcement! If you want to, I can give you the git log, early builds/screenshots or anything to prove that we did in fact not start this project earlier! :D
Thank you so much for your positive feedback!! Really appreciate it!! :D
As for the making process, there were a few handicaps I've had. I've played a lot of Rhythm Heaven last year so I understand rhythm games and how they work pretty well. In fact this was one of the inspirations behind the gameplay! And I've been self-studying a lot on the topic of how the games work and what I feel is necessary, hence some particle effects because they really give a lot of life to the game!! I still wish the menu screens had transitions, because that would also make the game much more alive. I also wanted to put this knowledge to use for your submissions, and that's why my comments on the other submissions are so detailed! I hope I can help other people make great games too!! :D
And, most importantly, scope creep is your enemy. Keep your ideas at bay, you will have plenty of time to extend them after the jam if the minimal viable product is good enough!