YMMV / Jupiter Hell

• Demonic Spiders:
  • Archreavers, which hurl acid balls at you that not only hurt like hell, but turn the tile you're on into acid. This in turn forces you into either eating further hurt (if you keep attacking the reaver) or moving out of the acid (squandering a turn and possibly your cover). Either choice can get you killed if you're being careless.
  • Toxic enemies, which hurl toxic balls at you which hit you with the Poisoned status. Getting too many stacks of this without health packs will lead to your slow demise.
  • Warlocks, which have an aura that regenerates the health of nearby enemies, and have a nasty flame attack that can really ruin your day, much like the Archviles. Archwarlocks are even worse, with a powerful Gaze that inflicts constant Pain on you as long as you are in their line of sight.
  • Medusae, which have an innate dodge bonus against all incoming attacks, unleash powerful plasma AOE attacks, and can permanently take away three HP per hit in melee. Archmedusae also have a monster beam attack that hits like a truck from line of sight, and super-armor while charging it up.
• Difficulty Spike: Io is where the game starts getting rough. Not only are you faced with heavily armored and high HP CRI bots, but it is also where plasma and poison enemies as well as Medusae and Warlocks at higher difficulties start appearing (see Demonic Spiders above).
• Hilarious in Hindsight:
  • This isn't the last time the creator of a Doom fangame has made a stand-alone, commercial Spiritual Sequel of said fangame which isn't part of the Doom franchise, as Sergeant_Mark_IV is developing a Spiritual Sequel of his famous Brutal Doom mod named Brutal Fate. Last but not least: both Jupiter Hell and Brutal Fate are set around Jupiter.
  • The game's marketing advertised its premise as being "like chess, with shotguns!" Jupiter Hell predates by a few years the 2022 turn-based strategy game Shotgun King: The Final Checkmate, which consists in a Variant Chess where you play as a lone shotgun-wielding black King against all the white chess pieces.
• Most Wonderful Sound: That squishy meat noise an enemy makes when you manage to gib them. It's satisfying even below Nightmare difficulty (where rampant gibbing is useful if not mandatory for survival).
• Scrappy Mechanic: Pain, which is even worse than its DRL equivalent. Every time the marine takes damage it adds a stacking debuff to accuracy, which can quickly lead into a death spiral as the player can't fire back or reliably escape without taking massive damage, especially in the case of beefy melee enemies. Luckily, it only lasts a few turns - but it can still be an unpleasant surprise to someone used to more traditional roguelikes, a genre where most games religiously observe Critical Existence Failure.
• That One Level:
  • Callisto Anomaly. The branch that leads to it can generate as early as Callisto 2, and is also chock full of demons, which means by the time the player hits Anomaly it's highly likely they're low on ammo, badly wounded, and not having much in the way of equipment or trait building. But what's that? An empty space in the middle surrounded by healing and rare items? Cue teleport sigils, archreavers, and a quick trip to the post-mortem screen.
  • Dante, as a whole. If Io is where Jupiter Hell starts getting rough, Dante is where it just outright says "Fuck you and die".