Games like Critternauts
Games like Critternauts include FINAL FANTASY, Chained Echoes, Monster Sanctuary, Persona 3 Reload, and Persona 4 Golden. We matched them by the tags players give Critternauts on Steam (RPG, JRPG, Party-Based RPG, Exploration, and Metroidvania): closest matches first, and among equally close ones the better-known games.

FINAL FANTASY
Shared: RPG · JRPG · Party-Based RPG

Chained Echoes
Shared: RPG · JRPG · Pixel Graphics

Monster Sanctuary
Shared: Metroidvania · Exploration · Turn-Based Tactics

Persona 3 Reload
Shared: JRPG · RPG · Party-Based RPG

Persona 4 Golden
Shared: JRPG · RPG · Party-Based RPG

FINAL FANTASY II
Shared: RPG · JRPG · Party-Based RPG

Persona 5 Royal
Shared: JRPG · RPG · Party-Based RPG

FINAL FANTASY IV
Shared: RPG · JRPG · Party-Based RPG

Digimon Story Time Stranger
Shared: RPG · JRPG · Party-Based RPG

Cassette Beasts
Shared: Party-Based RPG · JRPG · RPG

ARIA CHRONICLE
Shared: JRPG · Party-Based RPG · RPG

Suikoden I&II HD Remaster Gate Rune and Dunan Unification Wars
Shared: RPG · JRPG · 2D

Clair Obscur: Expedition 33
Shared: RPG · JRPG · Exploration

OCTOPATH TRAVELER II
Shared: RPG · JRPG · Party-Based RPG

FINAL FANTASY VI
Shared: RPG · JRPG · 2D

FINAL FANTASY V
Shared: RPG · JRPG · Party-Based RPG

Bug Fables: The Everlasting Sapling
Shared: Party-Based RPG · RPG · Exploration

Metaphor: ReFantazio
Shared: RPG · JRPG · Anime

Sora no Kiseki the 1st
Shared: RPG · JRPG · Party-Based RPG

FINAL FANTASY III
Shared: RPG · JRPG · Exploration

Record of Lodoss War-Deedlit in Wonder Labyrinth-
Shared: Metroidvania · Exploration · RPG

TROUBLESHOOTER: Abandoned Children
Shared: Tactical RPG · Turn-Based Tactics · Party-Based RPG

ASTLIBRA Revision
Shared: JRPG · RPG · Metroidvania

Tactics Ogre: Reborn
Shared: RPG · Tactical RPG · JRPG