This is very well polished.
The controls are smooth, the visuals and music combined to give a nice "go, go, go!" sort of vibe.
Well done!
:)
Three things that I would suggest changing:
1) the red text on the black background for the game page is hard to read - I would suggest a different colour, or at least bolding it all;
2) I think you're aware of potential volume issues, given the volume warning ,but I found the high pitched SCREEE at the end particularly loud and jarring - I would turn this down;
3) I think it would be good to "massage" the randomness a bit; truly random experiences are often not as fun as partially random ones- e.g. I got a very hard level for level 2, which was a bit rough because I was still learning the controls, and (later on) I got the same level 3 times in a row, which was a little boring.