1) there a feather icon (light mode) in setting of the game, with 32x version and feather mode, pretty sure there wont be any more lagging.
2) Thats in 0.4, that will released in a week.
3) I think yes, because I saw some teasers of the same in the discord channel, but don't know if that be added in 0.4 though.
4) As of 0.3.9.1 no, but from 0.4, there will be 2 versions, one will have animated video but its for $10 and above patrons and another one will just be having images.