Interesting idea. Was quite difficult to get used to. My advice for anyone having trouble. Focus on the black line in the center. Use your peripherals, and don't get into a habit of mirroring your hand movements with each other otherwise you will most likely move into a line while trying to move on side out of a line.

oh man this is crazy , so simple but addicting, i like music too .
very tricky when changing to different colour .

Addicting, despite its simplicity.
However, the game becomes significantly easier once I zoom in and slow down my computer.

Very good, in my opinion

Awesome sauce. Game is simple enough - but a great challenge to try to get the right brain and left brain to coordinate. Music is fantastic - I was totally bopping along as I played this!!

Yeah - first time I played this, I too didn't realise I had to control BOTH squares... worked it out next go! Medals work - do what I do when unsure - click on a medal to see if it has unlocked! (Yeah - medal pop-ups are annoying in fast paced games!)

I find returning both squares to the top after each line a big help!

A cool addition to this would be a sequence mode (as opposed to random lines): this could get crazy fast!!