Once upon a death is a necromancy themed resource management clicker.

The idea is innovative and I love the art style, but the gameplay is terrible, you're essentially just idling as you create zombies and then smashing them into castle after castle.

I can't tell if the game wants to be a clicker or an idler, but it does both terribly, the zombie summon rate is incredibly slow with no way to increase it, but it has no window mode and will pause if you minimize the game.

Upgrades to zombies take time, you can only upgrade one and a time, and there's no queue system so you have to be watching it constantly. There's no audio cue when a new batch of zombies are created so you need to check that regularly too. This means you are essentially clicking a few times, then waiting 10~20 seconds and repeating the process a few thousand times. Ridiculously repetitive as you will need at least 100 level 3 zombies for the final castle.

There's also no point in defending your castle from counterattacks (besides the achievement) as you only lose soldiers if you lose (with an upgraded ditch you actually come ahead sending all your units on the initial attack), not that losing resources would matter.

The game is poorly balanced, the only resource you will need initially is Metal and by the time you reach half way through the map you will likely have millions of resources and nothing left to upgrade.