I think dropdown boxes look neater and more professional - you could have a "search by..." one with things like reviewer, genre and so on, and then another one for the compatibility (since there's only 2 or 3 options for it)
and maybe even one or two for category, depending on how long they'd end up being (which depends on the category) - you could then use the space currently occupied by the genre options on the left-hand side for it since that'd be incorporated.
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