XCOM (most enjoyed Enemy Within, with Long War, other versions also generally good), just a masterpiece.
Into the Breach, probably the cleanest, and a great theme.
Lots of deck-ish based battlers: Slay the Spire (1 and 2), Backpack Hero, Monster Train
The Last Spell, Battle Brothers
Lots of D&D or adjacent stuff that board/tabletop-like: Balder's Gate 3, Gloomhaven/Frosthaven.
Edit: Wasteland series and Shadowrun series also great.