I think this is great on so many levels. It scratches that puzzle itch I get every now and again The timed mechanic is a fun challenge allowing me to replay levels to get the optimal path and try to do it as quick as I can. Doesn't pertain to me but the just thought of a color based color game could be a great tool to teach kids their colors.
Now that I'm several levels deep I'v took a hand at making my own and making my room mates try to level creator!
It's a very fun casual game but can also be pretty intense at times when trying to get the best path and doing it as quick as possible.