Turning noughts and crosses into a deck-building roguelike isn't something I wasn't expecting, but it's real and Tic Tactic releases on September 18th. There's a demo available on Steam right now too that should run fine with Proton on Linux.
Tic Tactic transforms the classic childhood game into a high-stakes roguelike. Players face off in turn-based battles, using a tic-tac-toe board to deal damage by creating combos. Every move counts as the board doesn’t clear, meaning mistakes linger and opportunities stack. Each run introduces new enemies, environments, and narrative discoveries as players push further into the mystery of what happened at the Duck Pond.
A deck-builder too as you get to place down over two dozen unique tiles, adding another layer to the classic game. These tiles give abilities ranging from board-wiping moves to precision strikes on the enemy.
Seems like another unique little indie game that might be worth a bunch of your hours. Release date trailer is below:

Direct Link