I own a web marketing company tk - we'll design your site, setup a massively targeted PPC campaign with your keywords, do research to find which ones will be the most efficient, get you some long tails if even needed, and then consistently tweak and improve your content to improve your click to opt-in rate (clicking the link to your site from the ad ---> downloading the game on the site)
i have a guy who will handle all this for you, i won't do any of the work just collect the vast majority of the profits, so let me know if you're interested and I'll put you in talks with him next year (or earlier).