grammarist.com/usage/anyways/

Although considered informal, anyways is not wrong. In fact, there is much precedent in English for the adverbial -s suffix, which was common in Old and Middle English and survives today in words such as towards, once, always, and unawares. But while these words survive from a period of English in which the adverbial -s was common, anyways is a modern construction (though it is now several centuries old).