Art is really cute. As for the concept and gameplay, even after I figured out I was looking for Mamizou, it felt like I just eventually had to resort to clicking around randomly. Maybe her leaf was covered by another bird sprite?
Unfortunately due to Scratch's jankiness, the best solution was to run a line of code that pushes Mamizou to the front of the screen. This works half of the time, and it's mostly due to a lack of time to code in detection for overlap that looked nice.