I really adore the clean style, presentation, audio and careful teaching.
I'd love it if there were more levels! Once I thought that the real game starts, we got to the end :)
I quickly found the tactic to spam spacebar to keep my FLOWs together.
During the tutorial level, somehow on the first run the door did not appear for me and I thought that one of the colored borders will somehow open after I get them all. I spend some time playing around and not really getting it, so maybe that caused the problem? Restarting the game and completing the tutorial quickly made it work properly next time.
Solid entry!