Thanks for playing and for the review PicusB! I have that on my backlog to fix the violet / purple colors as they are too close. As for the sporadic-ness (Coined a new word here), that was intentional to make the game a bit non monotonous. In the end it will always be random, so sometimes it changes slower and sometimes the colors repeat. No two game plays will be the same.
I plan on completing all the mini games and achievements and hope that will also add to and bring replayability to the game.
Thanks again for playing....and I loved your game too btw.