thanks for all the feedback! Meanwhile, I've also tilted the rounded tails a bit. I gotta say I prefer those characters this way; they seem to have more identity now with respect to the full-descender characters.
I've finally committed to a straight /gamma (the curved one has always been bugging me) and added some optical correction in /lambda and /mu (at the expense of some geometricity). The /eta's right stem is indeed a bit wider than the left one; I inherited that from /n, which my eye insists needs that extra weight due to the curved-away top half... for the /eta, I've now reduced the stem width a bit since the descender gives it more presence.
Yes, I've seen more /a-like alphas in many other typefaces... I changed to this version as a reaction to Gerry's (vague) edict that my glyphs weren't Greek enough. I actually quite like the current version.
Deltas with spiky top left corners are a thorn in my eye; I'd rather stick to the round version. Curving the stroke end back down is an idea to consider, though space is already quite cramped up there in the Black master. I do like the way the horizontal ascender bar resonates with those of /zeta and /xi.
As for non-ascending /phi, I find that's a very chirographic design that tends to look forced in geometric sanses. Unless there's a problem with the current ascending one, I'll stick to that.
The /kappa follows my design for /k, which is one of the defining features of Quinoa. Do you think I can pull it off? Chirographic /kappa seems to allow for quite a few architectures, including some that look like a Swiss school script /x...
Thanks for the gallery! Is it just my impression due to lack of familiarity with the script, or do those Greek fonts borrow from each other more heavily than the Latin ones? Is innovation so frowned upon in Greek, or is it just that those are designed mostly by non-Greeks who don't dare stray too far from the established paths?
Given that Raphael asks specifically asks about Glyphs (and about Retina-friendliness), we can assume he has a Mac.
Raphael: I believe Glyphs will cater to all the needs you listed. I suggest making use of the free trial month to check whether this is true. If you can't find a certain functionality, ask on the Glyphs forum — it's probably already implemented, and if not, it might be within easy reach of a custom script.