So, talking with the developer regarding the stuttering on many of the devices, they were trying to get it figured out and hoped to have a response soon.
Got an email the other day, they fixed the stuttering... however, they fixed it by making the game NON-Retina. They've said that people couldn't tell retina from non-retina, and while I'll admit it's not like watching a CRT TV and then watching a 4K tv, but we ALL know there's still a significant difference.
I'm really disappointed, as the game is stunning, but after this update... Maybe I'll leave it to my kids, they do seem to enjoy it. This is really disappointing.