Well, you can also try the campaign mode but you need to "copy game_variables.txt from the native folder into the sayazn one". Mind you, the campaign is nowhere near a complete state, some scenes (like the gashajin castles) are incomplete and unmaneuverable, some troops have wonky stats, and I am sure that there are tons of incomplete and unimplemented features. If you want to test it out give it a shot though, it's pretty amazing.