I'm impressed you have so many levels! Seems like they are randomly generated which does make the difficulty sometimes swing up and down - but it's very relaxing and chill so that's not a huge deal.
The art was nice and the music was relaxing.
I do feel like the "counting down" aspect was a little shoe horned in - in fact I think the game would probably be better without it as it did add a little stress whereas no limit on rotates would encourage more experimentation. But still a good game that I could see someone spend a lot of time on.