Emily Short's games are always intriguing and original, Indigo is no exemption. It's a wonderful short IF. The story was compelling and the magic system interesting.
Please keep in mind that Indigo was written in a couple of days and is marked as unfinished. That being said, it did have a weakness: game play. For most of the game, I found myself playing 'guess the verb', though to be fair, the about did say it was unfinished and as such, was bound to have problems. The main thing I had a problem with was (Spoiler - click to show)correctly formatting the command to take time. I knew from the beginning I needed to transfer a month from the apple to the potion. Yet when I tried take month from apple, the interpreter informed me that the month was part of the apple and couldn't be taken. take month, the correct command, and take month from apple should produce the same results. The game, while brilliant, was riddled with small errors like this.
In spite of this, I would recommend indigo to any and all IF players.