I rarely play mobile games, but here’s one that I quite like when I need to kill time or be active while media is in the background: Auralux 2.
I initially thought that the game wasn’t properly weighted for difficulty, but then found that I just needed to adapt my strategy. I can complete most levels in 2-3 minutes, though some might take 4-7 depending on how it breaks (I play on the fastest setting after getting good at it on normal speed).
I pick it up when my partner pauses to get a snack, go to the bathroom, or take an important call. I can set it down as soon as she’s ready because there’s no real stakes; I’m really just competing with myself to score faster and faster “best” times. I also play it while listening to podcasts if I can’t be physically active (or when I’m lazy).