The auto battles keep things relaxed, but there is still enough roster fiddling to make formation changes worthwhile. Later waves can expose a weak lineup pretty quickly, and moving a few Einherjar around or changing their upgrades can completely alter a run. Damage multiplier, God Mode, and currency multiplier are already unlocked in-game, which makes resource farming and routine fights considerably less fussy.
The graveyard-management angle gives the usual idle RPG formula a stranger flavour, and it fits the Einherjar theme nicely. Offline earnings also mean the roster keeps growing while you are away. Good pick for anyone who prefers checking in, making a few smart adjustments, and letting the numbers do some of the heavy lifting.