From the page's intro:
One of the problems with any mobile game store is that the sheer number of poorly programmed, trivial or novelty titles that get approved means that finding the good stuff isn't easy. What's needed is a games storefront that's a hundred times smaller. But has the 1% of content that's really good.
There are several notes on the page, but I'd also add a caveat that I've explicitly focussed on great games for the 'modern Symbian' generation - i.e. games that run well on the Symbian^3/Anna/Belle devices. Several of them do also run fine on older hardware (e.g. Nokia X6/5800, etc.) but there are no guarantees.
If anyone wants to put in the work to do a similar job explicitly for S60 5th Edition or S60 3rd Edition, then I'll be happy to link over, etc.
In the meantime, you can find the Curated Symbian Games Directory here. Enjoy!