Hello,
The game is good.
I liked the background music. :-)
The idea is interresting but in my oppinion the randomnes of the color can be harsh.
Sometime I had to wait for more than a minute to have the good color.
An idea would be to generate a random color series (like 3 at a time) and show it to the player so he can plan his next move in more strategic manner, also this will give you the opportunity to add a timer for a better replay value .
Have a nice day.