Not a fan of the spinning boxes at all. Cool but not functional for a webmaster coming in looking for a casino to play at?
Look into on page seo for pages like : Free Play Casinos | Free Spins
Also consider how you will be driving traffic to your website. If by SEO primarily, you will need to add substantially more content.
Consider putting advertising on the following pages as well : Casino Slots, little history.
I love that you are using WordPress!