Since everyone needs to bring up a different Tetris, here’s a casual reminder that Tetris 99 remains the best game on Switch and possibly the best Tetris, which makes it possiblissibly the best game ever? The concept of piling up 99 simultaneous players is great, the different challenges give you a reason to play every day, there are tons of modes (incl. private rooms), and it still receives new events frequently.
If your “domestic competitor” likes Puzzle Fighter but you want to even the odds on a more neutral field, Baku Baku Animal should be right up your alley(s). The concept is very (suspiciously) similar to Puzzle Fighter, with a system of matching consumable blocks (animal food) and consuming blocks (animal heads). There is no strategy in terms of match-ups, as the garbage is more or less randomized and not tied to a specific character, but the flow of the game is also quicker and with more frequent attacks compared to Puzzle Fighter.
Speaking of games with the consumable/consuming schtick, a personal favorite or mine is Kururin Pa!, and more accurately its precipitated sequel Shingata Kururin Pa!. It’s kind of a mix between Panic Bomber and Blodia / Pipe Dream.