It can be done. While Flash pages remain a challenge to optimize in search engines, it is interesting to note that some websites with all-Flash pages rank high on Google. Search for “chocolate” and the number 1 and 2 sites are Godiva and Hershey – sites with no text and all Flash. So what’s giving them a high Google presence? It’s all about linkage.
It looks like the primary search algorithms are about optimized website content, but on getting the most relevant content to a search. That means they have the most links from relevant chocolate sites.
From blogs, forums and websites that deal with the subject, the brand reputation seems to do the trick. This may have evolved over time and have a brand name that’s most recognizable even outside of online presence. Unless you have that much market awareness of your product, it’s still safer to have a mix of Flash and text-rich HTML pages. This is more SEO-friendly than having an all-Flash website.