Games like Siralim 3
Games like Siralim 3 include Siralim 2, Stoneshard, Coromon, Siralim, and Digimon Story Time Stranger. We matched them by the tags players give Siralim 3 on Steam (Creature Collector, Collectathon, Dungeon Crawler, Procedural Generation, and RPG): closest matches first, and among equally close ones the better-known games.

Siralim 2
Shared: Creature Collector · Collectathon · Dungeon Crawler

Stoneshard
Shared: RPG · Turn-Based · Procedural Generation

Coromon
Shared: Creature Collector · Collectathon · Turn-Based

Siralim
Shared: Creature Collector · Collectathon · Dungeon Crawler

Digimon Story Time Stranger
Shared: Creature Collector · RPG · Collectathon

Chained Echoes
Shared: RPG · Turn-Based · Pixel Graphics

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

Monsters' Den: Godfall
Shared: Dungeon Crawler · Turn-Based · RPG

Tales of Maj'Eyal
Shared: Dungeon Crawler · Turn-Based · RPG

Monster Sanctuary
Shared: Creature Collector · Pixel Graphics · Fantasy

FINAL FANTASY
Shared: RPG · Pixel Graphics · Fantasy

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

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

Pathfinder: Kingmaker - Enhanced Plus Edition
Shared: RPG · Fantasy · Party-Based RPG

Shattered Pixel Dungeon
Shared: Dungeon Crawler · RPG · Turn-Based

Divinity: Original Sin - Enhanced Edition
Shared: RPG · Turn-Based · Fantasy

Aethermancer
Shared: Creature Collector · Turn-Based · Dungeon Crawler

Baldur's Gate 3
Shared: RPG · Fantasy · Turn-Based Combat

Battle Chasers: Nightwar
Shared: RPG · Dungeon Crawler · Fantasy

UnderMine
Shared: Dungeon Crawler · RPG · Pixel Graphics

Cassette Beasts
Shared: Creature Collector · RPG · Turn-Based Combat

Megaloot
Shared: Dungeon Crawler · RPG · Pixel Graphics

Digimon Story Cyber Sleuth: Complete Edition
Shared: Creature Collector · RPG · Turn-Based

Rift Wizard
Shared: Dungeon Crawler · Turn-Based · Procedural Generation