Edit: I just found out you in fact can assign commands while the game is paused with P key, so have that in mind when reading review. I'm also changing from 'not reccomend' to 'recommend' but leaving the rest of the review untouched.
In the beginning it looks promising - nice relaxing graphics and music, lemmings style gameplay, plenty of levels, more variants to get to the finish, etc. And for the first few levels it works really well but later on the game starts to show its flaws. Most of all it's the controls in combination with the level design. The controls works like this - to assign some function to a spirit you have to click on it and then click on a corresponding button. The spirit stops on its place until you assign him his function (which is good) but the other spirits are still walking forward. And because they're all in one dense line you have only few seconds (like two or so) to click on the right button before the second spirit outruns the selected one and jumps to his death (for example). This is not only flaw in the controls by itself, the worst part is that many levels use this as a challenge - the game uses it's own weakness against you. Great example of this is the 30th level where you have to control three different lines of walking spirits at the same time. You have to be not only really fast but also very accurate so you don't choose unwanted function. After a few good levels the game changes from relaxing to this really annoying attention and eye-hand coordination test. It would be much, much better if you could just simply assing functions to the spirits when the game is paused or if the level design wouldn't rely on superhuman reactions. But this is not the case.
-Some interesting achievements
-Flawed controls / level design