Whilst I only recently came across your game, I just want to say again I've had ablast playing it and really admire it.
Having played things like pathfinder in the past and having to trawl through the feats, I think anything under 100 is a good number. I think as long as you keep the traits relevant and intuitive to their names as you have done, you should be good. It means that often people can take a good guess at what a particular trait does, or be reminded quickly just by the title, so no trawling through an online SRD and having millions of tabs open.
I think at the moment you have 35 after having a quick count? Maybe try for 50 and see how it feels?
Once again though, I really enjoy it and now you've mentioned an update I can't wait to see what you have in store :)