Am I the only one who feels it's on easy side? Granted, I have only played four rounds (with all four rounds ending with peace), but I just get the strategy of just sending money away, and stop anyone for building up their army and looking at others' clay. And if I need money, I'll just ask anyone who is still cooperative.
That being said, it is a novel idea to add things in, like giving the player more actions (some kind of hotline?), related event tree ("one important person have been killed,""Possible false flag (and 'real' event to spice things up)," "Setting / Changing alliances," and possibly too more to add), and possible middle ground between total war and total peace (Possible war between two nations with little commitment).
It is a fine game for the first game, and there are still many interesting idea to explore. :D