Am I Doing Wrong ? (Description & Keywords)

i have mario flash games website, i mostly use 3 keywords as my keywords & description (in wordpress yoast plugin)
is this good idea?



does it effect my ranking in feature, its brand new website started 1 month ago if its not good then how to proceed, in descriptions i will write about the game, how to play, controls etc= i have seen some of sites they are doing like this))

comments appritiated i thankful

The description part should have an appealing text to encourage click throughs, its for visitors and not search engines though having your keywords in there does help but make it as part of a descriptive text.