Thanks for playing.
If you find a Flow is bright red，it usually got heated enough. This feedback is indeed not obvious, feeling the different centripetal forces may helps. I should give specific sound and animation effects to different states to distinguish them.
In most situations, the reason maybe is that some FLOWs have not been found, because the FLOW sometimes be extremly slow when they are far from the group.Yes, it's a bug.Another bug may cause this situation is that when a FLOW is near the edge of the screen while it's quite slow，it will be nearly static, and when these happen, its size will be very tiny so that you could hardly see it. It seems like the FLOW is "Stranding". I'm still thinking of ways to optimize the algorithm.