I actually just got the chance to test on my friend's old Motorola Droid, and even though the phone is over a year old, it is currently able to run the game at around 18-22 FPS (and there are still a few more optimizations I'd like to try, if we have enough time in the next couple of days).
As for the Samsung Moment, I'm afraid we haven't found a phone that old to test on yet. The Moment is almost a year and a half old, and from what I found online, it does not have any sort of hardware-accelerated / OpenGL rendering. I will try to find a tester to get the final say, but I think you may be overdue for an upgrade. (I recommend the Inspire or the Thunderbolt!)