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https://store.steampowered.com/app/2949320/Ratatan/

It is also available at the same price in GamesPlanet UK in case you wanna play it safer with the fees and taxes.

"i don't know if the key can be activated in all country, but i just redeemed it in France"

If the key won't activate in your country, then a yellow colored box that says "Will not activate in your region!" will be below the add to cart button. If you try to add it to the cart, the site will go to your cart and show "REGION LOCK: You cannot purchase this product"

So as long as you can add it to the cart it should be okay. That said none of these sites will let me buy the game, so.