This was my favorite 2017 Ifcomp game. I don't see how to make a meaningful review of this one, without touching on the hidden content, which is more than half the game. If you cannot find the hidden content, check out David Welbourn's excellent walkthrough.
The Wand is a very polished puzzle-based text adventure, where the player seeks out a challenge at Bartholloco's secluded castle. The player is not allowed to touch anything in the castle, except from the wand, he/she is given at the beginning of the game. Luckily the wand is magical and can be set to 1000 different color combinations. The wand has different abilities depending on the chosen color combination. Unfortunately you do not know which combinations are useful, but clues to this are placed around the castle.
The apparent challenge of the game has a very nice level of difficulty and can be completed in approximately 2 hours. However, (Spoiler - click to show)if you restart and approach the game with your knowledge from your first play-through, you may find a much deeper and more involved challenge.
It is during this deeper challenge you will come to realize how well thought out the magic system actually is. Also, the ending of this deeper challenge is much better than that of the first challenge.
I don't think a pure puzzle game comes much better than this.