Is Breathedge really just Subnautica in space?

What they genuinely share

The core loop is the same one, and both studios describe it in near-identical terms. You survive a crash, scavenge your surroundings, and craft your way up from bare hands to real tools, vehicles and shelter, all while keeping an eye on the resource that keeps you breathing. source: Steam store page: Subnautica (Unknown Worlds Entertainment) source: Steam store page: Breathedge (RedRuins Softworks / HypeTrain Digital) Subnautica has you building diving gear and submersibles to reach deeper water; Breathedge has you building suits and craft to push further into a debris field. Swap "ocean" for "vacuum" and the sentence barely changes. That is why the recommendation engines and forum threads keep pairing them.

Where the comparison falls apart

Tone is the big one, and it is stated plainly by the developers rather than inferred. Breathedge is sold as an "ironic outer space survival adventure," a comedy with an immortal chicken and a running joke about the many stupid ways you can die. source: Steam store page: Breathedge (RedRuins Softworks / HypeTrain Digital) Subnautica trades in "wonder and peril," and its reputation is the opposite of comic: quiet awe punctured by real fear as you go deeper. source: Steam store page: Subnautica (Unknown Worlds Entertainment) One is trying to make you grin; the other is trying to make you nervous.

Scale and standing differ too. Subnautica is the genre's mainstream success, rated 97.1% positive on Steam across 378,116 reviews, with an 87 on Metacritic. source: Steam user review summary: Subnautica (all languages) (as of 2026-08-10) source: Metacritic: Subnautica (PC), critic Metascore (as of 2026-08-10) Breathedge is smaller and more of a cult pick, at 81.6% positive across 16,826 reviews and a 71 Metacritic. source: Steam user review summary: Breathedge (all languages) (as of 2026-08-10) source: Metacritic: Breathedge (PC), critic Metascore (as of 2026-08-10) Calling Breathedge "Subnautica in space" flatters the shared idea while glossing over the fact that one game reached a far larger audience and a higher critical bar.

Which should you play first?

There is no wrong order, and neither is a sequel or prequel to the other, so nothing is spoiled either way. If you have never touched the genre, most people find Subnautica the safer first step because it is the benchmark. If you already know you want the lighter, funnier version, or you are on a tighter budget, Breathedge is a fine place to start. source: Steam store page: Subnautica (Unknown Worlds Entertainment) (as of 2026-08-10) source: Steam store page: Breathedge (RedRuins Softworks / HypeTrain Digital) (as of 2026-08-10) One practical note that applies to both: they are single-player only, so this is a solo journey whichever you choose. source: Steam store page: Subnautica (Unknown Worlds Entertainment) source: Steam store page: Breathedge (RedRuins Softworks / HypeTrain Digital)

For the head-to-head table and the buying verdict, see the full comparison or run the decision helper.