Thanks for the info (I thought I tapped L2/R2 furiously but nothing happened. Probably too big to eat). I tried to grab the clouds once it got too long, but it's hard to control. Should have a FPS view so I know when to dive into the donut hole of the cloud.
What generated the icons ? Sometimes it does, sometimes it doesn't.
The hearts are the equivalent of 'dust clouds' from moving. Keita Takahashi said there's no reason for that, other than being more positive.