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.