This will be a short post since I didn't get too far this week.
Idea: I saw this vine and thought "I want to make this; there's got to be a game in this".
What went right: I ended up with a pretty good starting point for something interesting to work on at a later date.
What went wrong: I didn't spend as much time on it as I wanted to due to the holidays.
What I learned: Music games are a lot trickier than I first anticipated.