Thirty-five odd years ago, the first Metroid proved that game design wasn't an exact science. Corridors that led to nothing, rooms that looked identical, enemies that could damage you in loading zones. All horrible ideas, stuff that would end up making the game understandably impalatable to the modern tongue, but also important, essential, even, to characterizing a truly hostile world. Later entries in the series significantly neutered this feeling, creating environments that players weren't only comfortable traversing, but staying in for extended periods of time, meticulously collecting every health tank and missile upgrade. It seems apparent that trying to make something genuinely alien will always be at odds with "good" game design, which typically revolves around the familiar, the intuitive, and the satisfying, but it's still a shame that the original Metroid's vision never wound up fully realized.

Until now, that is, and from Adult Swim of all publishers. The Rain World mantra is simple: you don't belong here, this world owes you nothing, and it will give you nothing that you don't take for yourself. You probably won't beat this game, and you definitely won't get 100% map completion. You'll have to excuse the obvious hackery of mentioning both Metroid and Dark Souls in the same review, but it's enchanting the way a first playthrough of Dark Souls is enchanting. A world as harsh as it is beautiful, with the desire to learn more about it your only motivation through its crushing difficulty. But, by comparison, even Lordran offered more kindness. At least, there, stairs were built for your feet and ladders for your arms. There are no bonfires in the rain world, instead your only points of safety constrained, metallic cages, as if complete isolation from the outside world your only true protection from it. Play perfectly for an entire cycle and you still might die to something outside of your control, right before getting to the next shelter. That's bad game design, just like any unfair mechanic is, but Rain World has loftier ambitions than being a well-designed game. Traditionally, unkillable enemies exist to be defeated later in a cinematic, cathartic payoff, but here, predators never stop being terrifying. Neither do heights, neither does the open sky, and neither does rain. Terrain should subtly guide you to where you're supposed to go next, and entrances to new regions definitely shouldn't be unceremoniously hidden in plain sight. We wouldn't want players to miss something important, would we? My only nitpicks come from the few concessions to this mentality. Mainly, the map, which too often serves as a nondiegetic crutch for players to lean on. It's hard to imagine anyone being able to complete the game without it, but that really only reinforces my argument. What's less understandable is the inclusion of the yellow ghosts, which seemingly show up when you're playing badly in order to patronizingly point out food and enemies.

But assessing Rain World's flaws truly puts its monumental strengths into perspective. Because what's possibly more impressive than everything that went right is the sheer amount of things that could've gone wrong. The game could've used upgrades to create a concrete sense of progression, an artificial way to counteract being at the mercy of your environment. The experience could've been cheapened with side characters or a more explicit narrative. If the enemy AI was even slightly more predictable, or the creature design not consistently haunting, then the exhilaration of a chase would've been greatly diminished. If there wasn't an enormously deep bag of tricks to figure out, both regarding how the game works at large and what your character is capable of, then it wouldn't be able to require so much creativity in its minute problem-solving. Things might've gotten stale if every single region didn't have a distinct way to throw you even further out of your element. And none of this stuff would've mattered if each and every screen wasn't individually memorable in how it tests a specific part of your skills, and yet meticulously constructed to feel naturalistic. Locations effortlessly fit together to paint a world where you don't belong, but also one that you can conquer if you're clever, persistent, and lucky enough. As it stands now, Rain World is a supreme balancing act, its resounding success as improbable as the survival of a slugcat in the wild. Undoubtedly one of the premiere achievements of the generation, and, hopefully, one of the most important.