Unto Deepest Depths

Unto Deepest Depths builds its entire tactical identity around a single, strict rule: every unit on the board must both move and attack on its turn, whether or not that action actually accomplishes anything useful. Developed and self-published by McCollum Games, it launched as a full, non-Early-Access release on 11 December 2025 at a low asking price, following a period of public playtesting that had already given a small group of players hands-on time with the concept. Steam's audience response so far is entirely positive, though the review count remains small enough that this should be read as an early, enthusiastic signal rather than a settled consensus -- worth stating plainly before anything else.

One rule, a surprising amount of depth

The clearest throughline across the available review corpus is genuine admiration for how much tactical complexity the developer extracts from that one forced-action constraint. Reviewers repeatedly describe battles playing out like puzzles rather than conventional tactics encounters, since every unit's mandatory move-and-attack forces careful, several-steps-ahead planning to avoid wasting actions, exposing flanks, or catching allies in friendly fire. More than one reviewer reaches for board-game comparisons to describe the resulting feel, one explicitly likening certain units to chess pieces and another comparing the deterministic, puzzle-solving tension to Sokoban. Distinct unit types -- warriors, archers, spear-wielders and mages are named specifically across reviews -- carry genuinely different movement and attack ranges, giving positioning decisions real weight even within battles that typically play out on a single small screen rather than a sprawling map.

A run structure reviewers call tense, in both good and frustrating ways

A specific, recurring theme across the review corpus concerns stakes. The game's roguelite structure sends players back to the very beginning on a loss, and reviewers are split on how that lands even within an otherwise uniformly positive sample -- several describe the permadeath reset as giving every single move genuine weight and tension, appreciating that it prevents players from coasting once a run is going well, while others describe the same structure as occasionally frustrating when difficulty swings sharply within a single playthrough. More than one reviewer specifically notes that steamrolling through the early game doesn't guarantee safety later, since certain late-run map and enemy combinations can turn a comfortable lead into a sudden loss with little warning -- read by some as maintaining valuable tension throughout, and by others as a balance rough edge worth smoothing out.

A specific, practical quality-of-life request

A narrower but concrete complaint concerns the friction of the core rule itself. At least one detailed review requests a basic auto-attack or skip option for units that have no meaningful action available on a given turn, noting that the strict move-and-attack requirement currently forces players to manually target and confirm an attack that accomplishes nothing -- occasionally even hitting their own units by mistake in the process of fulfilling the rule. It's a small, specific piece of feedback rather than a fundamental critique of the design, but it points at a genuine rough edge in an otherwise well-regarded core loop.

A modest presentation built for clarity over spectacle

Presentation draws comparatively little discussion across the review corpus, which several reviewers frame as its own kind of compliment -- the deliberately simple, old-school graphical style is repeatedly described as clean and functional rather than a selling point in its own right, prioritising legibility of unit ranges and threat zones over visual flourish. That clarity matters more than usual for a game built around forced, mandatory actions, since misreading a unit's attack range can mean an unavoidable wasted turn or an accidental hit on an ally; more than one reviewer specifically credits the game's mouse-over tooltips and range indicators for making that information easy to parse at a glance despite the modest art budget. A branching event map between combat encounters, drawing an explicit comparison to Slay the Spire's node-based structure from at least one reviewer, adds a light layer of run-to-run variety around the core battles without asking the presentation to do more than it comfortably can.

What the achievement curve suggests

Global achievement data offers a useful, independent check on how punishing the game's roguelite structure actually is in practice. The first boss encounter sits at a healthy 59.0% of all owners, but that figure drops sharply with each subsequent boss -- 44.7%, then 29.1%, then 17.7% for the fourth -- and the achievement for actually winning a full run sits at just 10.1% of all owners. Achievements tied to reaching deeper post-victory difficulty tiers fall away almost to nothing, clustered around 0.4% each. That data corroborates the review corpus's description of a genuinely difficult, permadeath-driven structure where most players who pick the game up don't see a complete run through to the end, consistent with reviewers who single out its swingy difficulty and unforgiving reset as real, if not dealbreaking, friction points.

Final verdict

Unto Deepest Depths is a small, sharply-designed tactics roguelite that gets real, specific mileage out of one clever constraint -- forcing every unit to move and attack every turn transforms simple, one-screen battles into genuine puzzles, and the reviewers who've found it so far are enthusiastic about the result. Its permadeath structure and occasionally swingy difficulty won't be for everyone, and a specific request for basic quality-of-life improvements like auto-attack options is worth taking seriously, but at its low price this is an easy, low-risk pick for tactics and puzzle fans willing to look past a still-small review base. Recommended for anyone drawn to forced- action tactical puzzles in the vein of Into the Breach or Sokoban, with the caveat that broader consensus on balance and longevity is still forming.