Primrose is already available (US Store at least).
I've purchased it because I like this kind of puzzle game.
First of all it's a slow paced game. In fact, you have all the time you want. It's the opposite of Frenzic for example. Well I think you all know what I mean.
The gameplay is simple: two tiles per round; the first you place anywhere but the second in the same row or column; the goal is to surround another color by another one then you score and more free space is open for you to play; the game is over if the board is filled. There's no twists such as a special tile. There's no game modes or difficulty levels. It's a plain puzzle game.
The graphics are simple but nice. Colorblind aware. No music but subtle sounds.
Online high score (including daily) and the ability to see a game replay of one of those listed there (interesting and unique feature).
Game can resume which is very important by the way.
Advice: before starting a new game (it starts with a new game) go to menu and write your name so your first score gets your name!
My first impression: the graphics and sound work for the game tho something modern and advanced would fit better in a new game concept (it does not look polished); the gameplay is nice: it's better than Otello and Lights Off alike games (those used to describe how Primrose looks like); I don't feel addicted but I'll surely play it more due its unique approach.
For those that like puzzle games it's recommended for sure.
My rate is 4/5 (graphics should be better, the first score should force you to write your name, icon is so so).