The keywords metatag is practically deprecated by the methods of contemporary search engines, which look for keywords in the body rather than in the head of a document. This delivers (or is supposed to deliver) more relevant results. That said, 35 words does not constitute keyword stuffing and it should not have any adverse effect with any search engine that may mark down for such techniques. Among the most important factors are high quality incoming links, with some relevance being an apparent advantage and the right balance of keywords in your content. That is a simplified hint at SEO and SEM; you could write a book about it and plenty of folk have.