The controls feel really nice and smooth to me. The style is nice and it was a good idea to have the edge of the walls bright and colour-coded so you can see them from a distance and prepare (a bit confusing that you can sometimes see the colour inside the wall though). Even still, there are some sections where it feels like it's impossible to get past as you can't see it until it's too late - such as a few green shortly followed by red in a corner. I almost always missed the blue.
Could feel less punishing if the difficulty increased slowly as well as periods of rest after a difficult section.