Games like Rapture
Games like Rapture include XCOM 2, Darkest Dungeon® II, Darkest Dungeon®, Stoneshard, and Warhammer 40,000: Mechanicus. We matched them by the tags players give Rapture on Steam (Turn-Based Combat, Sci-fi, Dungeon Crawler, RPG, and Party-Based RPG): closest matches first, and among equally close ones the better-known games.

XCOM 2
Shared: Turn-Based Combat · RPG · Sci-fi

Darkest Dungeon® II
Shared: Dungeon Crawler · Roguelite · Turn-Based Tactics

Darkest Dungeon®
Shared: Turn-Based Combat · Dungeon Crawler · RPG

Stoneshard
Shared: RPG · Turn-Based Combat · Dungeon Crawler

Warhammer 40,000: Mechanicus
Shared: Turn-Based Combat · Sci-fi · Turn-Based Tactics

Into the Breach
Shared: Turn-Based Tactics · Sci-fi · Roguelite

Dungeon of the ENDLESS™
Shared: Sci-fi · RPG · Dungeon Crawler

Mewgenics
Shared: Turn-Based Combat · Roguelite · Turn-Based Tactics

STAR WARS Zero Company™
Shared: Sci-fi · Turn-Based Combat · Turn-Based Tactics

Caves of Qud
Shared: Turn-Based Combat · Sci-fi · Procedural Generation

Crown Trick
Shared: Turn-Based Combat · Dungeon Crawler · RPG

The Last Spell
Shared: RPG · Turn-Based Combat · Turn-Based Tactics

Quasimorph
Shared: Turn-Based Combat · RPG · Singleplayer

Legend of Keepers: Prologue
Shared: Turn-Based Combat · Dungeon Crawler · RPG

Moonlighter
Shared: Dungeon Crawler · Roguelite · RPG

UnderMine
Shared: Dungeon Crawler · Roguelite · RPG

Path of Achra
Shared: Turn-Based Combat · RPG · Dungeon Crawler

Clair Obscur: Expedition 33
Shared: Turn-Based Combat · RPG · Party-Based RPG

StarCrawlers
Shared: Dungeon Crawler · RPG · Sci-fi

Megaloot
Shared: Dungeon Crawler · RPG · Roguelite

Cyberpunk 2077
Shared: RPG · Sci-fi · Cyberpunk

XCOM®: Chimera Squad
Shared: Sci-fi · Turn-Based Tactics · Turn-Based Combat

The Binding of Isaac: Rebirth
Shared: Dungeon Crawler · Roguelike · Indie

FTL: Faster Than Light
Shared: Sci-fi · Roguelike · Singleplayer