Kernel Hearts PS5 Review - Magical Girls Meet Their Maker

Kernel Hearts, developed by the Argentine studio Ephemera Games and published by Whitethorn Games, launched on September 17, 2026, for PlayStation 5. It is a multiplayer co-op roguelike action RPG that blends fast-paced hack-and-slash combat, magical girl transformations, and light visual novel-style elements. Players take on the role of members of the elite M.A.H.O.U. Unit, or super-powered android magical girls, each tasked with ascending the shifting, sentient Tower of Babel to eliminate God and his angelic army in order to save the world from post-apocalyptic peril.

The story is set in a ruined, ash-choked world drawing inspiration from a post-apocalyptic Patagonia, weaving Japanese anime aesthetics and storytelling with Argentine cultural details that reflect the developers’ background. Humanity’s remaining survivors hold out in the city of Babel on the tower’s outskirts. After each expedition, the unit’s memories reset to a laboratory backup, creating a cycle of repeated climbs while permanent bonds and upgrades persist. Themes of sacrifice, the cost of power through the “Heavenly Curse” that enables transformations, and squad camaraderie against overwhelming odds run throughout.

The core playable squad features four distinct magical girls whose personalities are reflected in their combat styles. Fernet, the Argentine captain and versatile all-rounder who uses a saber along with telekinetic and spirit powers, Spika is a disciplined close-range fighter wielding a katana with precise attacks, Laika, the physically imposing heavy hitter from a Russian background who swings a massive greatsword, and Dolce, whose performance-oriented style incorporates dance and flair in a nod to classic magical girl tropes. Supporting NPCs in the hub city and tower additionally allow players to interact and gift items to deepen bonds, adding light social and relationship layers to the mix.

The Gameplay ...

Gameplay in Kernel Hearts centers on fluid third-person combo-centric combat in which players mix attacks, spells, movement, and unique powers to create devastating combinations against waves of enemies, with each floor or domain culminating in a boss fight against a guardian. One of the game's mainstay mechanics lets players temporarily transform into full magical girl form by harnessing the tower’s power to dispel the Heavenly Curse, delivering a powerful area attack and boosted state. 

Collecting pink and blue soul orbs, minding a climbing sin status meter that increases enemy difficulty as it peaks, picking from random power-ups or magika upon leveling up, and finding trinkets in chests that add to the character's build are also part and partial of the layered progression system. In fact this collect-a-thon gimmick revolving around leveling up, collecting souls and items, and looting chests is one of the core features of the roguelike loop, outside of combat.

The roguelike structure, itself, features procedural and shifting layouts along with temporary power-ups that change each run, while death or completion returns players to the hub to spend rewards on permanent upgrades. Ultimately equipping up to 256KB of customization chips onto the Unit MAHOU.OS for tailored builds. Bonding with allies through gifts and interactions provides narrative depth and potential benefits as well. 

The game supports solo play or online co-op for up to four players, and the primary objectives revolve around climbing floors, clearing enemies and bosses, gathering resources, and ultimately reaching the top to confront God. 

The Presentation ...

Visually, the game leans heavily into anime-inspired character designs, portraits, and cutscenes that stand out for their charm and style, particularly in transformation sequences and key art, while environments and enemy designs are less detailed and articulated. The overall art direction clearly shows passion though. The soundtrack, composed by Diego Cabrera, mixes energetic, atmospheric, and lo-fi or electronic elements with anime flair.

The Verdict ...

In terms of playability, Kernel Hearts offers an accessible yet replayable loop of combat runs, customization, and squad bonding that works well solo or with friends, though combat refinement and balance can vary depending on the player. Replay value benefits from the roguelike variety, distinct character playstyles, permanent upgrades, co-op options, and relationship systems that encourage multiple climbs and builds. 

Priced at around $20, it represents fair value for an indie action-roguelike with multiplayer and narrative elements. Overall, I feel the game is best suited for fans of anime-style action RPGs, magical girl aesthetics, co-op roguelikes that mix elements of run-based progression with squad combat, or those seeking a story-driven experience playable in shorter sessions. It particularly appeals to players who enjoy character bonding and distinctive combat personalities. Those put off by the sacrilegious and anti-christian aspects may want to skip this one though.