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My website is a collection of educational games for children.  We are currently in the process of doing all the onsite page optimization for the individual game pages (they currently have no title tags, meta descriptions, H1, etc.) We created several different games to teach each particular skill.  For example, there are 4 different games children can play to learn vowels.  While offering several different games is good for the user, I am concerned as to how best to target a keyword for each particular game page without creating keyword cannibalization. Being new to SEO, I am not sure how targeting on each page different variations of  related terms would affect SEO.  For example, if one page were to target the term "vowel games", and another the term "learning the vowels" are these keywords similar enough to cause keyword cannibalization?  If yes, would a proper solution be to use a canonical tag and designate one game as the "primary" game page for vowels? Ideally, I realize that the best SEO solution would be to have a landing page created just for "vowel games."  Yet we created our landing pages based upon school level (preschool, kindergarten, first grade, etc) thinking of the user experience where a child only has to navigate to a single page to find all of the games for their age range. I greatly appreciate any help in better understanding the best way to avoid any potential problems with cannibalization.