Such a Nice Game :)
Some people are rating low because the game is a little hard to control (the fish has a momentum once it starts moving) but once you get the hang of it the game is simple and pretty and easy.
The levels do essentially have 4 stages each from level 2 to level 8, and you cant stop in the middle of a level and save, but the levels are pretty quick and easy for most of them. The game gets a little harder as you play (there are a couple different puzzles and a maze) but the basic objective is easy. You collect the colored fish and bring them to their matching color flower and make the flower bloom. There is a little bit of a mini game along with this to collect all of the puzzle pieces (4 per level) and all of the stars (also 4 per level). Also, they have achievements so you can go back and play a level again and maybe do it better and not just play the game through again for no reason.
I think for $2 this game is cute and fun and somewhat calming. It is definitely worth $2.
Beccasauruss about
KOI - Journey of Purity