Like the idea, I think the music and atmosphere are great together.
I think the theme of time is well executed, and you should be proud of your project :)!
Things that made me lower the score a little;
-the forward/backward sound is quite disruptive and loud (a change in tone for forward/backward would have made a nice addition too!)
-5 seconds is quite some time to wait everytime and grows frustration (atleast for me)
-The dynamic blocks blend in too much with the background