Thanks for your attention and collaboration, DUTOIT!
I solved the recognition problem changing the Textbox by SpriteFont.
This was simple to fix, but I'm so stressed out doing everything alone (game design, graphics, animation, programming etc.) that doesn't think of it first.
Since I'm new in the C2 community, I'm out of everything that has happened. Only knew the Ludei was a good solution and, taking these limitations, I am quite satisfied with the service they offer.