Petal Crash.

Versus puzzles are my favorite genre, but they're all dead and buried today. Panel de Pon isn't coming back unless Intelligent Systems figures out how to put a dating sim in it. Dr. Mario and Puzzle Fighter both got turned into mobile gacha games, and then shut down. Puyo Puyo looked like it was set to make a comeback, but then Sega sold its soul to sell more Tetris.

Petal Crash is more or less the one good thing that has come out of the last decade or so. Sadly being such a small indie meant it never got much of a playerbase, some activity around launch but I haven't been able to play it against a human opponent in a very long time.