IMHO.

Games like Planet Nine

If Planet Nine is your kind of game, the closest matches are Hovertron, NeverDeath and BOULDER DASH 40th Anniversary — picked from the ranked list below. Each pick is ranked by what players of this game also play, shared genres and tags, and review-mined similarity — not a generic popularity list.

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About Planet Nine: It should be out there, but no one's found it yet. A planet merge puzzle themed around "Planet Nine" 🚀 Flick planets to merge them and grow from small stars into giant planets 🌟 2-5 minutes per play — casual enough to pick up anytime, and easy to keep coming back to 🪐

CasualWindows · macOSby haizai
Planet Nine — Steam game cover

Players who liked Planet Nine also play

Steam players who put hours into Planet Nine also tend to own these titles — a signal called collaborative filtering. imho.run cross-references millions of library ownership patterns to surface games whose real audiences overlap, regardless of whether their genre tags match.

  1. Hovertron

    WHY THIS

    Top pick for Planet Nine fans by collaborative filtering across millions of Steam libraries.

    Hoverboard your way through a physics-based platformer. Easy to learn but hard to master; Flow and flip through a series of levels to chase perfect runs. Compete on a global scoreboard, or hunt down the secrets hidden throughout the game.

    ActionIndieEarly AccessSteam ↗
  2. NeverDeath

    WHY THIS

    Second-strongest match for Planet Nine fans by collaborative filtering across millions of Steam libraries. Shares Casual with Planet Nine.

    NeverDeath is a fighting game set in our own solar system centuries in the future. Explore the intricacies of the unique left/right fighting system while battling across the solar system as nine distinct characters.

    2022ActionAdventureCasual19.99 USDSteam ↗
  3. BOULDER DASH 40th Anniversary

    WHY THIS

    Third-strongest match for Planet Nine fans by collaborative filtering across millions of Steam libraries. Shares Casual with Planet Nine.

    BOULDER DASH® 40th Anniversary – A legend returns! Immerse yourself in 40 years of video game history and experience the classic BOULDER DASH® in an epic anniversary edition!

    2025ActionStrategyIndie19.99 USDDeck VerifiedSteam ↗
  4. About LAST Chanks

    WHY THIS

    Ranked #4 for Planet Nine fans by collaborative filtering across millions of Steam libraries.

    A tense solo and online co-op puzzle platformer. Two damaged robots share one draining energy supply through a physical cable. Coordinate every move, explore the ruins and find the legendary Chank before both systems shut down.

    ActionStrategyIndieSteam ↗
  5. ASTA-POOL: The Future of Pool

    WHY THIS

    Ranked #5 for Planet Nine fans by collaborative filtering across millions of Steam libraries.

    It is the year 2629, and you are with your girlfriend at a futuristic game-room called the Asta-Pool Club. To prove you are worthy to play there, you must beat their bots in a variety of action, arcade, puzzle, racing, and pool-themed games. Along the way, you discover the Club's hidden menace!

    2024ActionSportsStrategy14.99 USDSteam ↗
  6. Ash Battle

    WHY THIS

    Ranked #6 for Planet Nine fans by collaborative filtering across millions of Steam libraries.

    Ash Battle is a Sci-Fi minimalist survival game with a Bullet Hell style. Ash is on an unknown planet and has found many enemies who didn't like his visit. Prepare yourself and be ready for battle, because they come in huge numbers.

    2022ActionStrategyIndie2.99 USDSteam ↗
  7. Prove it Blob!

    WHY THIS

    Ranked #7 for Planet Nine fans by collaborative filtering across millions of Steam libraries. Shares Casual with Planet Nine.

    Prove It Blob is a relaxing puzzle game where you solve riddles and use the power of telekinesis to rearrange the appearance of the world.

    IndieCasualSteam ↗
  8. Anna & Emma - Paper Adventure

    WHY THIS

    Ranked #8 for Planet Nine fans by collaborative filtering across millions of Steam libraries. Shares Casual with Planet Nine.

    Step into the Paper Adventure of Anna & Emma:  a cosy puzzle game designed for kids and parents to enjoy together. Enjoy the local cooperation in 2,5D!

    AdventureCasualSteam ↗

Free alternatives

Free-to-play games that recommended players of this title also tend to enjoy.

  1. Helltaker

    WHY THIS

    Free-to-play pick from the same recommendation pool — no purchase to try it.

    Helltaker is a short game about sharply dressed demon girls.

    2020IndieAdventureFree To PlayFreeDeck PlayableSteam ↗
  2. Bongo Cat

    WHY THIS

    Free-to-play pick from the same recommendation pool — no purchase to try it.

    Bongo cat needs your help. Bongo cat needz more hatz!!! Every time you press a key, Bongo cat will punch your taskbar. Type, click, play, work to collect more points. Which hats will you find?

    2025IndieSimulationMassively MultiplayerFreeDeck PlayableSteam ↗
  3. Indigo Park: Chapter 1

    WHY THIS

    Free-to-play pick from the same recommendation pool — no purchase to try it.

    Explore the abandoned childhood wonder of Indigo Park! Guided by Rambley the Raccoon, help restore power to the destroyed amusement park while you run from the reason it shut down.

    2024ActionIndieAdventureFreeDeck PlayableSteam ↗
  4. Sheepy: A Short Adventure

    WHY THIS

    Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Casual with Planet Nine.

    A Short Handcrafted Pixel Art Platformer that follows Sheepy, an abandoned plushy brought to life. Sheepy: A Short Adventure is the first short game from MrSuicideSheep.

    2024IndieAdventureFree To PlayFreeDeck PlayableSteam ↗
  5. Our Life: Beginnings & Always

    WHY THIS

    Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Casual with Planet Nine.

    A twenty-dollar bill, four summers, fifteen years, and a one of a kind life. Create an experience that’s all your own in this near-fully customizable visual novel where you grow from childhood to adulthood with the lonely boy next door.

    2020IndieFree To PlayCasualFreeSteam ↗
  6. Travellin Cats in Paris

    WHY THIS

    Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Casual with Planet Nine.

    Find 100 cats hidden in Paris, France in this cute hand-drawn hidden object game by Travellin Cats - the original viral hidden cat game creator!

    2023IndieFree To PlayCasualFreeDeck VerifiedSteam ↗
  7. Grimm's Hollow

    WHY THIS

    Free-to-play pick from the same recommendation pool — no purchase to try it.

    A spooky, freeware RPG where you search the afterlife for your brother. Reap ghosts with your scythe, explore haunted caves, and eat ghostly treats on your journey through death.

    2019IndieAdventureRPGFreeDeck PlayableSteam ↗
  8. Virtual Cottage

    WHY THIS

    Free-to-play pick from the same recommendation pool — no purchase to try it. Shares Casual with Planet Nine.

    Virtual Cottage gives you a comfy place to rest and be productive without any distractions. Open the game, set yourself a goal and enjoy the atmosphere.

    2020IndieSimulationFree To PlayFreeDeck PlayableSteam ↗

Frequently asked about Planet Nine

What games are most similar to Planet Nine?
Based on Steam play patterns and shared genres/tags, the games most often recommended alongside Planet Nine are Hovertron, NeverDeath, BOULDER DASH 40th Anniversary.
Who developed Planet Nine?
Planet Nine was developed by haizai.

imho.run ranks Steam game alternatives using a mix of collaborative filtering (ALS / iALS / EASE / LightGCN), content scoring over genres, categories, Steam tags, developers, and publishers, plus AI-extracted vibes mined from review text. The page above is generated in seed mode anchored on Planet Nine.

For library-aware picks tuned to your specific taste, sign in with Steam on the home page.