2021 - Micesweeperget - Has a couple of interesting twists: You have to move a little mouse round to mark cells, which limits you slightly, and it adds Nonogram-like hints to the edges of the board.
2021 - Metavaxxget - Mimesweeper with Shooter elements.
2023 - The Wizard Ran: Chapter 6play - RPG, Desert Island stage has a mimesweeper section.
RiscOS came/comes with a mimesweeper I've seen called Flag Day and MineHunt. I don't have a proper date.