You know Flash content is invisible to search engines. In order to have your Flash page (or game) indexed, you have to create an HTML page with some keywords, and pray.
Today, something is changing in Search Engines Optimization (SEO) techniques.
Look what Google and Adobe have to say
Adobe is providing optimized Adobe Flash Player technology to Google and Yahoo! to enhance search engine indexing of the Flash file format (SWF) and uncover information that is currently undiscoverable by search engines. This will provide more relevant automatic search rankings of the millions of dynamic content that run in Adobe Flash Player.
Without additional changes to content, developers can continue to provide experiences that are possible only with Adobe Flash technology without the trade-off of a loss in search indexing.
It will also positively affect the Search Engine Optimization community, which will develop best practices for building content utilizing Adobe Flash technologies, and enhance the ability to find and monetize SWF content.
Source: SWF searchability FAQ
Q: What do I need to do to get Google to index the text in my Flash files?
Basically, you don’t need to do anything. The improvements that we have made do not require any special action on the part of web designers or webmasters. If you have Flash content on your website, we will automatically begin to index it, up to the limits of our current technical ability.
That said, you should be aware that Google is now able to see the text that appears to visitors of your website. If you prefer Google to ignore your less informative content, such as a “copyright” or “loading” message, consider replacing the text within an image, which will make it effectively invisible to us.
Source: Improved Flash indexing
How can I get benefits from that?
If a successful SWF file will link to some external sites, maybe this will affect PageRank or at least help sites ranking.
A link to a sponsor in a successful game probably will get more valuable, and maybe people that look for your game will be able to find it in the official page and not in one portal with better ranking than your one.
Just rambling of course, but I am very very interested in it…