I don't intend to be condescending, but I honestly can't help it in this situation.
Did you even try googling "Right Click to Necromance"? Because if you had, the first link is https://juicybeast.itch.io/right-click-to-necromance which has a link to download it. It's PWYW so you just click "no thanks take me to downloads" and you get a link.
Right Click To Necromance but online, as suggested by markiplier in his let's play of the game. I've always wanted this.
Just make different enemies and a different art style or something to avoid being too similar.
I guess "Right Click To Necromance" meets your criteria (kind-of). It's probably not what you are looking for, but might be worth to check it ouy. It's a fun mini-game that you can DL for free from https://juicybeast.itch.io/right-click-to-necromance
The LONGEST shot, but Right Click To Necromance?
https://juicybeast.itch.io/right-click-to-necromance
Otherwise, is it a modern-era game, or a fantasy thing? Was the zombie thing a focus of the game, or just a special ability one team had? Warhammer Total War might have something like that, but not throughout the game.
What were the graphics like? 3d models or sprites? Could you zoom in/pan around?