Cubic Cosmos

Developed by: Inkstone Atelier
Published by: Inkstone Atelier

Apr 28, 2026$12.99

Cubic Cosmos is a thrilling fast-paced roguelike card game. You have been trapped in a deadly game. One wrong move could see you reduced to a plaything of the goddess. Can you free yourself from the endless cycle and escape your fate?

Consensus

C69.9/100

Steam players92% positiveVery Positive1,003 reviews

VG Insights estimate ↗≈67.9K copies · ≈$593K gross

What creators say

PepperHead

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Cubic Cosmos is an auto-battler-style deck-building roguelike where you place up to five units on a board and they attack on their own, with most cards granting permanent buffs for the rest of the run. He enjoys the big-number combos and the feeling of understanding the systems well enough to break the game. The runs become repetitive, the art style, music and sound design feel weak, and information and keyword clarity are poor. He recommends it to people who like the concept but places it in mid-low B.

Liked

Permanent buffs from nearly every battle make progression feel big and unusual for the genre
Building broken combos is super satisfying, especially the first few times
Lots to do between battles, plus triple and fuse mechanics to duplicate effects
VFX are satisfying: explosions and flying tokens
Rewarding to learn, since system knowledge directly produces crazy effects
Different champion classes change things somewhat
Developers were not afraid to use huge effects

Disliked

Game is very easy to break, so it often ends up as one card then waiting for animations (his Steam review: the deck played itself)
Repetitive and redundant after a few runs
Art style feels uninspired, almost AI-generated in vibe; music and sound design are weak
Too much on screen, enemy effects are hard to track, and player info is meh since you usually just kill everything
Card effects and complicated keywords are poorly explained and hard to visualize

What players say

A fast-paced roguelike deckbuilder with tower-defense-style lane combat (monsters attack back to front) from Inkstone Atelier, built around run-long stat stacking and explosive combo chains.

Cubic Cosmos is a low-profile but well-liked indie: Steam shows about 1,000 reviews at roughly 92% positive (Very Positive), with recent reviews noticeably weaker (about 68% of a small recent sample). Players praise its permissive, break-the-game synergy building, the run-long scaling of cards and a generous amount of content (12 heroes, 240+ cards). The main sources of negative sentiment are undisclosed generative-AI card art, a sense that the game is easy/repetitive once a build snowballs, and unclear UI/keyword explanations. It launched in Early Access on Sept 16, 2025 and had its 1.0 launch on Apr 28, 2026, with the dev apparently still patching (an earlier reviewer flipped to positive citing steady improvements). No critic coverage exists on Metacritic (page has zero critic reviews) and nothing turned up on OpenCritic.

Players love

Anything-goes synergy building: players love assembling absurd, over-the-top combos and scaling to huge numbers, and like that the game does not try to cap power the way Slay the Spire-style games do
Stat boosts from spells, monsters and events last for the whole run, so cards genuinely grow and you plan around growing specific units
Selling cards in shops (about 50% value) instead of paying to remove them eases RNG pressure and encourages pivoting builds
Lots of content and variety: 12 heroes across 3 classes with distinct synergies, 240+ cards, 50+ relics, multiple modes and 10+ difficulty levels
Strong 'one more run' pull; several reviewers report 25-60 hours and one 260+ hours
Satisfying combo chains with lots of animation and effects going off; the game feels powerful from the very first run
Doll Code system lets you export cards and share/receive others' pawns and replays, adding a light meta layer
Low price ($12.99) relative to the amount of content, frequently cited as great value

Common complaints

Undisclosed generative-AI card art is the top complaint: the two most-upvoted negative Steam reviews (93 and 125 helpful votes) cite odd fingers, repeated poses and 'obviously AI' cards, and people say they feel misled
Game is easy and repetitive for some: one reviewer beat the top difficulty with every character without a loss, with decks effectively locked in by the first boss
Heroes are said to play too similarly, with hero abilities easy to ignore (only a couple felt truly distinct to that reviewer)
Stat stacking has little downside, so builds converge on a few stat enablers plus a few hard hitters
UI/readability gaps: card types (artifact vs sorcery etc.) are unclear, keyword phrasing is odd, and many things are left unexplained
Chain reactions can be too fast or opaque to follow, leaving some players confused about why their board was wiped
Technical rough edges: game freeze when starting a new run (pinned Steam workaround), buggy controller support, poor text on Steam Deck, a Linux launch failure (no native Linux build), a reported crash
Repetitive, looping music mentioned by a reviewer

Can feel tedious

Undisclosed AI art (some buyers refunded or wrote negative reviews purely over this)
Feeling the run is decided early, then just watching the deck play out
Long chains of auto-triggering effects that some find hard to follow
Having to learn unusual keyword terms (mobility, auto, death, lasting, charge) before the game clicks
Steam-page tags/marketing: players who expected a roguelite with persistent power-up meta-progression felt misled, since the dev reportedly said it is not meant to have that (though the game does have XP-based unlocks of cards/characters)

What's unique

Monsters attack from back to front in a lane/tower-defense style layout, so reaching enemy backlines is a real strategic lever
Most attribute boosts persist for the entire run rather than one fight, pushing a 'grow your cards' play pattern
Tension between prolonging fights to buff cards and finishing fast to earn more lucre (currency)
Selling cards for lucre instead of paying to discard
Doll Code system for exporting cards, sharing pawns and battle replays with other players
Hearthstone/Battlegrounds-like creature-and-spell feel mixed with roguelike path choices; reviewers compare the card-modifier depth to Inscryption

Players want

Disclose or replace the generative-AI art and be transparent about the art pipeline
Better in-game explanation of keywords, card types and monster effects, plus general QoL and UI clarity work
Add downsides or tension to stat stacking and make higher difficulties and late-game builds more varied (late-game builds called limited)
Differentiate heroes more so their special abilities meaningfully change play
Improve controller and Steam Deck support and fix the new-run freeze; community also asks for ultrawide support and more languages (Russian, German)
More Steam achievements, and clearer purpose for the dolls/meta systems (one reviewer collected dolls without knowing what they do)

Summarised from Steam reviews and community discussion.