NEW ON STEAM
Slime Trader
At a glance
Slime Trader game facts
Steam store information checked 2026-09-30。- Studio
- Lonely Knight Published by Enter the Game Studios
- Release
- Sep 19, 2026 Released
- Official genres
- Casual · Indie · Simulation · Strategy · Free To Play
- Play mode
- Single-player
- Desktop platforms
- Windows
- Steam Deck
- Unknown No additional compatibility detail
- Controller
- Not listed
- Steam features
- Achievements · Cloud · Family Sharing
- Languages
- 13 listed languages English, French, Italian, German
What that means for your setupSlime Trader is developed by solo studio Lonely Knight and published by Enter the Game Studios, released on September 19, 2026 as a Free to Play Windows title listed under Casual, Indie, Simulation, and Strategy. Play is single-player only, and controller support is not listed, so a keyboard and mouse on a Windows PC is the only confirmed way in. Steam Deck compatibility is not stated, which matters for handheld buyers since the official description says Steam Inventory trading, the leaderboard, and lobby chat require an active Steam connection. The supported interface languages are English, French, Italian, German, Spanish (Spain), Japanese, Korean, Portuguese (Brazil), Russian, Simplified Chinese, Thai, Traditional Chinese, and Vietnamese, and Steam features include Achievements, Cloud saves, and Family Sharing. No system requirements or Steam Deck verification status are listed in the store facts, which is worth weighing if your hardware is older or you specifically wanted to play on a handheld.
Slime Trader drops you into a fenced pen under siege from a swarm of larvae, and your only line of resistance is a growing flock of pixel-art slimes you summon, drag, and merge by hand. Place two of the same grade together and they evolve into something stronger, so the play is equal parts tactics and tamagotchi as you watch a thin skirmish line become a wall of laser-firing blobs chewing through bosses by the dozens. The hook for casual players is that the slimes attack automatically while you decide what to summon, where to park it, and whether to gamble your next merge on pushing toward the next grade.
What the game actually feels like
You summon random slimes, drag them into formation outside the pen fence, and merge two of the same grade to climb the ladder from F up through 12 grades to XXX, with each tier unlocking new attack styles like piercing rounds, spread fire, flames, lasers, explosions, and rocket barrages that visibly transform how your defense line behaves
There is a real build-crafting layer underneath the cute pixel art, with up to 16 runes slotted into a 4 by 4 grid that mixes eight effect types including damage, attack speed, critical hits, range, gold gain, boss damage, overdrive charge, and rebirth-point gain, so late runs feel like kit-building more than button-mashing
Rebirth resets your stage progress back to 1-1 and hands out points to draw more runes, but your slimes, gold, and summon cost all carry over, which gives the loop a satisfying long arc of pushing further each time instead of starting from nothing
Eligible high-grade slimes and runes can be sent to your Steam Inventory and traded with other players, and stage plus round progress is tracked on a Steam leaderboard, so the social layer is real even though the game itself is single-player
What early players are seeing
What is landing
- A player with around seven hours in called it a pretty fun idle game where you merge slimes and try to upgrade your fleet, and confirmed that you can export items to Steam to trade or put them on the market, which is rare for a free pixel-art title
- Another reviewer who started playing with a friend wrote that there is a real thrill in chaining and successfully evolving into a stronger slime and that even the sting of losing pushes them to try again, which captures the merge-game adrenaline the genre is built on
- A highly enthusiastic player with over 139 hours in said the way the bugs get teamed up on by the slimes is awesome, called the free-to-play model and stage clearing exactly what they were searching for, and gave it 5 out of 5 while noting the developer team is actively improving the game
- Several returning players describe the game as very addicting and a genuinely chill option for people who just want a low-pressure merge defense to dip into, with one recommending specific tactics like keeping S and SS grade slimes on the field instead of rushing upgrades
What still needs watching
- Multiple recent negative reviews and Steam community discussion describe launch-day server instability, with one player specifically referencing the great server crash of 9-19-26 and another flagging moments where the game fails to connect to the server at all, so online-dependent features may stutter during peak play
- The user interface draws frequent complaints, including UI elements covering the top of the pit so you cannot see or grab the slime you want, and the Steam lobby chat box overlapping the field, which is a real readability problem during busy waves
- Negative reviewers and several mixed ones call out steep success-rate drops at higher merges and the high cost of saving a top-grade slime from destruction, with one player reporting a quoted price of 7.49 to save a single XX slime that can immediately be destroyed again, which makes progression feel punishing if you care about top-tier collectibles
Is Slime Trader worth buying now?
Current decision
Wait for more reviewsThe pitch is genuinely appealing and the free price makes it easy to try, but the launch window shows real cracks: server outages on day one, UI overlap with gameplay, and sharp RNG spikes at higher merges are showing up across both positive and negative reviews. With only 28 user reviews and a 57 percent positive rating so far, the signal is too thin to call this a confident buy, especially since the Steam Inventory trading angle and the long-term merge economy are exactly the systems that benefit from a few weeks of community testing. Holding off for more reviews lets the developer time to patch the server and UI complaints that current players are already flagging, and lets you see whether the merge curve and save pricing feel fair once more players have pushed into the higher grades.
Who this is for
A good fit if you…
- Casual players who want a free, low-pressure merge defense they can run in short bursts or leave ticking in a corner while doing other things
- Collectors who specifically enjoy pixel-art creature rosters with 111 hand-drawn slimes across 12 grades to chase and evolve
- Players who like light build-crafting through a 4x4 rune grid with eight effect types and a rebirth loop that preserves their collection
- Anyone curious about Steam Inventory trading who wants a free entry point to try sending high-grade slimes and runes to their inventory and the community market
- Folks who enjoy chatting with other defenders in the global or language-based Steam lobby chats while they play
Wait if you…
- You need a stable server connection at launch, since day-one outages and disconnects are the single most common complaint in the early reviews
- You are sensitive to UI clutter, because multiple players report the chat overlay and other interface elements covering the field and blocking slime grabs during waves
- You dislike harsh high-grade merge odds and steep revival costs, since negative and mixed reviews both flag punishing success-rate drops and expensive slime resurrection
- You specifically want a verified Steam Deck experience, because the store lists Deck compatibility as Unknown and only Windows is confirmed
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