10000000 (Paid, iOS/Android): Roguelite Match-3 dungeon crawler.
You Must Build a Boat (Paid, iOS/Android): Sequel to the above with additional mechanics, more developed campaign, NG+, and daily challenges.
Luck Be a Landlord (Paid, iOS/Android): Slot machine roguelike where you add symbols with each spin. No actual gambling. Slay the Spire style Ascension mode lets you defeat your landlord!
Slice and Dice (Paid w/ free trial, iOS/Android): Dice-rolling roguelike with lots of different modes/scenarios. If you buy it on itch.io you get both mobile and desktop versions.
Dicey Dungeons (Paid, iOS/Android): Another dice-rolling roguelike, this one from Terry Cavanagh (VVVVVV). More emphasis on story, wonderful art and music.
Super Auto Pets (Free w/ paid expansions, iOS/Android): Asynchronous auto-battler with cute emoji animals. Free base pack and weekly pack, plus a few paid expansions packs.
Simon Tatham's Puzzles (Free, iOS/Android): FOSS collection of ~40 puzzle games.
Forkyz (Free, Android): Crossword puzzle app. Can download from a variety of free sources, even a few in French and German! Grab it off F-Droid.