A slow and unexciting concept.
MOST of the game is waiting for the circle to rotate. Most of the rest of the game is looking to see where you will go. The rest of the game is tapping the buttons at the right time.
Basically, players already know how each level is going to end, so the puzzle part of the game is solved within seconds. The rest of it is just pressing the buttons at the right time, which isn't hard. It just takes patience, and patience isn't inherently fun. Anticipation is fun, but that's not what this game builds by making the player wait. The worst part is, if you mess up, you have to do all that waiting all over again even though you know how to beat it and that you CAN beat it. It's just not engaging.
I see you made the space button speed up the rotation, but I still think that's not enough to make the game interesting to me.