Slitherine

Looks like Battle Academy - is it very similar?

Does it have a good SP campaign?

It's much more boardgamey than BA but for more info the Matrix forum is much more active so check there

http://www.matrixgames.com/forums/tt.asp?forumid=1040

The game is definitely more complex than Battle Academy however there is a whole gamut of scenarios ranging from easy to hard. Just remember if considering buying this game that it is a port of an actual boardgame and thus, for the most part, follows the boardgame rules that were already developed. So it feels much more like a true boardgame than Battle Academy does which many would consider a 'lite' wargame.