OK firstly I can't read Spanish so that limits constructive criticism
However one thing jumps out at me...you don't have any/many links to casinos on the front page. It's all about driving traffic down through the site. Thats not a bad thing - it pays to have a good structure and link to more detail, but the best sites always have the casinos/poker rooms etc visible and linkable the minute the visitor arrives at the site.
Its a fact that a large number of visitors do no more than skim over information and don't read a lot, so it would help IMO to have a few casinos listed on the homepage. In fact every page should give the visitor some choices of casinos to click on and go to.
Cheers
Simmo!