I don't post my score here - I feel ashamed when seeing the numbers of my "competitors" ;-)
I am glad you offered left/right arrow keys as an alternative for </> - here in Europe we have other keyboard layouts - using </> would have made me risk breaking my fingers :-D
A small improvement: Showing Score in-game when time is up would be nice, so I could see my last game state (what color combos I achived to create).
And a simple Restart button (or even key) would be nice - saves one click.