Haha, I'm here! Thanks for playing! Let me answer your points one by one!
First, regarding the gameplay: while it is technically a rhythm game, my original intention was to capture that relaxed sensation of subconsciously tapping your fingers on a desk when you are deep in thought or entering a 'flow state'.
However, we obviously hit a snag in the actual design execution. Since we listened to the music so many times during development, the rhythm felt natural to us, so we took the difficulty for granted, hahahaYUY! This happened because we didn't seek enough player feedback, and we will definitely keep this in mind for future projects! Thanks for pointing it out!
As for the source of the footage, it was collected from public television and online media!