Alex is correct that deleting and then reinstalling usually fixes most issues...however, Amanita did update the game to version 2.0.2 yesterday mainly to fix some compatibility issues with iOS 8 and also compatibility issues with the iPhone 6 Plus, and while I only have iOS 6 and an iPhone 4S, I upgraded and now the game crashes pretty much immediately after launching it (i.e., no opening screen or anything). And I have deleted the game and then reinstalled it but the game still crashes.
Do you have iOS 8 installed, Mestre? If not, perhaps upgrading to iOS 8 might resolve the problem. But either way I would suggest that you—and any other users in the same boat—contact Amanita Design to let them know about the issue using the form at the bottom of this page:
http://amanita-design.net/contact.htmlEdit: I'd contacted Amanita support about this and heard back that there was a known issue with backwards compatibility for version 2.0.2 with iOS 7 and 6, but that a fix was coming. And today I can confirm that his issue has been fixed in the latest version 2.0.3.