I was a little worried when I heard "Cymanti nerf," but on reading the details, I think it's a pretty decent set of balances that'll make them more fun to play. Of course, like everyone here, I've got one "but". :)
Increasing the cost of the raychi makes it really hard for Cymanti to cross oceans. The inability to put land units on ships means you're really reliant on algae to move them. And the inability to put algae on squares you don't control means you're really reliant on creating, then exploding raychis to complete bridges. It using Cymanti on water-heavy maps way harder because every such crossing is now much more expensive.