+ very polished

+ nice visual

+ fun

+ nice usage of circular map

- I guess we are required to say something critical so, I think we have seen so many games with simple mechanics that feature a ball and a circular map.

++++very polished game for every aspect(visual, control, juice)

+ the changing pattern of background, changing levels, and other effects combine well with the music. 

One thing I do notice as an issue for me is the orange color bar. First, it is the only orange color thing, everything else in the game is black color. It feels too much visual impact for a minor element of the game. Second, I personally feel it is very hard to dodge spikes after bouncing off the bar. I would advise having a safe zone near the bar to not spawn any obstacles. 

Overall very impressive game, well executed for the one button prompt.