Hi Pierre, nice blog post. Thanks for sharing your insights.

I was looking at your AppStore SEO. Like you mentioned, your position for "spelling" has dropped a lot. But there are other phrases where your positions are rising nicely...

For "crossword game for kids" you've gone from 10th to 7th in the past few weeks.

http://www.straply.com/app/apple/l-escapadou/montessori-cros...

And your Android version has a few phrases moving up too...

For the phrase "kids words" you've risen 6 places, from 23rd to 17th. I know 17th isn't awesome, but that's a fairly popular search phrase, so at least you're moving in the right direction.

http://www.straply.com/app/android/l-escapadou/montessori-wo...