Kernel Hearts is an action roguelite where you climb the Tower of Babel as a member of the M.A.H.O.U. Unit, slaying angels in a bid to dethrone God. It's magical girls by way of Nier-style melancholy, from Ephemera Games and publisher Whitethorn, and it came out in mid-September. Fourteen hours in, the herd's verdict matches the Steam page almost exactly (Mostly Positive, 76% across 209 reviews): the presentation, bosses, and music are a delight, and the moment-to-moment combat and early progression are where it stumbles.
You play Fernet, a magical girl who wakes up with her memory wiped, and part of the fun is rediscovering your unit and the wreckage of the world alongside her. The setup is bleak: magic-born children, military control, magical girls turned into androids, and a catastrophe that ended it all. The plot arrives in fragments, but the real weight is in the characters. Between runs you bond with the tower's inhabitants by gifting them things, and the crew opens up a little more after each descent. The writing is warm and the arcs of a few of the girls, especially Spika and Laika, land with real emotion. The religious imagery works more as scenery than as argument, and the world-building could go further. It's a story that runs on feeling, and it works.
Combat is approachable: light and heavy attacks chain into air juggles, perfect dodges trigger a slowdown, and a magical-girl transformation grants a burst of invulnerability and a big area attack. Fernet's saber and animal allies are fun, and the on-screen combo guide keeps things friendly. But it never gets deeper than that. Critics keep landing on "average" for a reason: the limited move set gets repetitive, enemy variety is narrow, dodging can feel finicky, and some hitboxes feel cheap. It's no Devil May Cry, and it's no Hades.
Bosses are the standout. Their attacks are well telegraphed, they reward learning, and they're the part most reviewers single out. The catch is that even on normal they carry a lot of HP, which can turn a good fight into a long one.
The roguelite structure is where the tension lives. Each floor of the tower has a rising sin meter: as it climbs, enemies toughen up, and at 100 a deadly angel arrives. You need to collect souls, relics, and upgrades and reach the exit in time. Levels are large and open and can be tackled in any order, which is a nice break from corridor crawlers, but the randomized layouts can eat the clock, and the timer reads as artificial difficulty. Leveling up means collecting pink souls and then finding a shrine, which several of us found a chore. Between runs, you return to the lab and install chips onto your unit, a 256KB budget you spend like a tiny operating system, and slow early meta-progression is the loudest complaint across the board. Early runs feel unproductive, even though materials carry over after death.
Up to four players can climb together online, and it's clear that the harder difficulties are designed with company in mind. The gap between modes is wide: Story difficulty is gentler and much friendlier to exploring, while normal and above can spike from the third map onward. Online lobbies ran well in our time with it, though latency can matter for dodges and combos.
Gorgeous where it counts: the environments and character portraits are colorful and expressive, and the anime cutscenes are dazzling. Character models and animations are weaker than the art around them, which stands out in motion. The soundtrack is excellent and fits each area. On the practical side, movement is locked to WASD with no remapping, which will annoy anyone with a different layout, and a good number of mechanics go unexplained.
Standout bosses, striking art direction, and a soundtrack and story that punch above the price. Held back by simple, repetitive combat, a timer that sometimes feels like padding, a narrow enemy roster, and a lack of tutorials for systems you really need to understand.
A full tower run can take up to two hours, and a couple dozen hours is realistic for a full playthrough, with bonds, chips, and builds to chase. But slow early progression is a real barrier, and the loop runs out of surprise before the story does. If you like the characters, you'll keep going. If not, you'll feel the grind.
One nostril, with a warm heart. Kernel Hearts is a magical-girl roguelite with more personality than polish: come for the bosses, the music, and the story, and bring a friend if you can. Start on Story difficulty, be patient with the first few hours, and don't expect the combat to be its strongest suit. At $19.99, it's a fair ask for fans of the genre, and a gamble for everyone else.
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