Quarks, eh? After 3 years, I think you have earned a bit of impatience!
It's on my 'would love to do' list, though as you've noticed my to-do list can stretch pretty far into the future. And with a lot of other projects popping up in the queue. What I wouldn't give for more hours in the day...
My rough to-do list:
(a) Shocktopus, and getting it out of beta
(b) Bond Breaker, and getting some new levels / science concepts in there (contract gig)
(c) Other contract work (bills, yo)
(d) Gravity Sim, which I've left hanging way too long
(e) Agent Higgs's quark levels, which would at this point involve a port to Unity (&release on Android phones)
(f) A long promised update to the Slide Rule
... in appx order of priority.
So I'd love to get down to it, after doing a solid pass on the Gravity Sim. As to a good estimate of when that would be... I'm bad at that. In order to make this a little bit less of a black box, though, I thought I'd do an experiment and
post my daily activities online. That way, in a glance, we can see what I've been working on lately.