As with advanced wars, there is a surprising amount of depth. There's your typical rock, paper, scissors style combat. Terrain benefits and penalties, capturing bases for extra resources etc.
There are less unit types that AW, however there are three separate "factions" each with their own specificities (lift and shift "races" from Starcraft).
Anyway for $0.99 (Iphone) and $4.99 (Android) it's a cracking buy, not sure why there's a difference, but either way, players on different operating systems can play each other.
So, thought if anyone's interested we could get a few forum games going on. Being turn based it's pretty conducive to those who are time-poor. Time limits of say 12hours can be placed on each move to give people a chance to get on with things. It's also got a hotseating mode, so have been using it to try to lure the missus into playing games slightly more complex than Whale Trail.
Post below if you're interested. Username: StrayAndroid