Puzzles were pretty fun! I'm glad they chose to insert new gameplay elements gradually together with the addition of new colours, otherwise the gameplay would have been incredibly stale. Now, the difficulty increases steadily, providing a nice challenge.

The story is very unnecessary in my opinion, but I would have found it strange if there was none either...So I guess I'm kind of on the fence on that one. Maybe the story could have been made more exciting somehow?

The secrets were the main downside. Having to wait until you have collected certain colours for you to be able to grab them is very annoying, because you cannot skip to puzzles directly. This means you need to go through every puzzle that comes before it, which is just unfun in my opinion.