I can't really comment on the mobile releases for this game, but from what I can see in the PC releases there are quite some limitations to the animations. Framerate seems to be limited to fractions of 60 fps (full, half, third, quarter, etc.). The fastest I've seen in this game is 20 fps. However, all animations are 16 frames, so framerate really just changes how fast those are played.
For image resolution, I don't know what the game engine supports.
Nonetheless, increasing framerate and/or resolution would increase file size considerably. An increase from 720p to 1080p would mean a 2,25 times bigger area (and thus probably file size). An increase from 16 to 24 frames would possibly also mean 1,5 times the file size. Both combined would bring us to 3,375 times the file size.
Looking at the "Lavish" and "Legend" Patreon rewards, the source material would at least allow for it (even for greater resolutions and framerates).