Cyan is easier than O8, we can't really complain yet again about grinding in general. Bunny slippers is a really old purple item and would have no place in this chapter. Not a lot really needs them in mass and they are cheap in stores now. Just don't do the Skeleton King legendary until no one else needs the slippers any longer, it's rather awful anyway.
However the lack of smoothies and high store price now is a concern that NEEDS to be addressed. I don't need them any longer so I have a huge leg up on anyone that needs to get 30+ (70+?) of these still. Please let it take the place of Hammer Time Scroll in chapter 20 or find another solution.
I'm also surprised the health boost isn't larger than it is. Do you do any internal testing with max heroes or is it just theoretical? I'm not sure at all that this is enough to prolong battles more than 1-5 seconds.
I'm glad some are getting an accuracy boost like Mega, Ninja and Archer, but poor Spikey will continue to be rather useless for another tier.