King of Dragon Pass can be played with VoiceOver, as can all the Choice of Games games. (For those, I'd recommend Lost Heir or Tin Star as good examples). If you're not using Voiceover yet, they're still relatively easy going using the magnifier. You might also want to try Frotz for iPad, which allows you to play classic and new text adventure games. (The app comes with many classic games.)

For more fast-paced games, Monsters Ate My Condo, Punch Quest, and Fruit Ninja are still playable with many levels of low vision. I found the original Temple Run to be more playable than the sequel due to its higher contrast palate.

You can check out the audiogames website for some more ideas, though it could use a little more curation:

http://www.audiogames.net/list-games/

Word Twist! was really easy to play when I could read large print.

Hopefully it hasn't changed in the past few years. You're given 6 letters and you have to form as many words as you can in two minutes.

If you can find a bejeweled game with large icons, that could be fun too.