A very pleasant experience, I noticed that clicking when there is an appropriate sweet on the screen or not made no difference but it was still really nice, I also tried playing through without clicking anything and it still continued so if anything a slight however minor incentive other than a high score for getting the collection right might have been nice. I would say maybe even a counter on the candies to show how many you've selected so far, or hold controls to subtract from the count;
Overall the game was really calming and I had a real nice time playing it for a few rounds.