Single-player games like Cosmic Slime Defense
Below are 8 single-player Steam games similar to Cosmic Slime Defense, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Cosmic Slime Defense page.
Ranked picks
- 1
Galacticon
Single-player alternative to Cosmic Slime Defense — playable solo, no multiplayer required. Shares Action and Indie with Cosmic Slime Defense.
Galacticon is a video game with the look and feel of arcade cabinet games from the early 80's in the style of Williams classics: "Defender" or "Joust", with the gameplay of legendary "Jetpac", and with touches of "puzzle".
- 2
Super Slinger
Single-player alternative to Cosmic Slime Defense — playable solo, no multiplayer required. Shares Action and Indie with Cosmic Slime Defense.
Super Slinger is a cute and funny pixelated arcade-like shooter where you fight against the alien invasion in an attempt to send them back home. Cute art, juicy gameplay, difficult stages, and SLINGSHOTS!
- 3
Space Depression
Single-player alternative to Cosmic Slime Defense — playable solo, no multiplayer required. Shares Action and Indie with Cosmic Slime Defense.
You must do your best to protect the world! Destroy all enemies. Get the highest score.
- 4
At The Downstairs
Single-player alternative to Cosmic Slime Defense — playable solo, no multiplayer required. Shares Action and Indie with Cosmic Slime Defense.
What, you can easily pass all the obstacles you face? So, are you our last hope? So, do you want some absurdity? And are you doing all this to beat the ZUMBEKUKKA at downstairs? Dude, you are really brave!
- 5
Code Arcturus
Single-player alternative to Cosmic Slime Defense — playable solo, no multiplayer required. Shares Action and Indie with Cosmic Slime Defense.
Code Arcturus is a retro inspired arcade-style action platformer, with aliens, robots, spikes, explosions, and lots of coins. Blast your way through levels, compete for the fastest times on the leaderboards in Speedrun mode, or put your skills to the ultimate test in Nerfed mode
- 6
UpBoll
Single-player alternative to Cosmic Slime Defense — playable solo, no multiplayer required. Shares Indie and Casual with Cosmic Slime Defense.
UpBall is a game of climbing up by controlling the speed of time Each death will not reset the level or let you start over If you are unskilled, then stop the time and think about what to do next The game is inspired by “SUPERHOT”
- 7
Downwell
Single-player alternative to Cosmic Slime Defense — playable solo, no multiplayer required. Shares Action and Indie with Cosmic Slime Defense.
Downwell is a curious game about a young person venturing down a well in search of untold treasures with only his Gunboots to protect him.
- 8
Spidersaurs
Single-player alternative to Cosmic Slime Defense — playable solo, no multiplayer required. Shares Action with Cosmic Slime Defense.
The nightmarish dinosaur-spider hybrids known as Spidersaurs have run amok! Armed with an arsenal of awesome weapons, it's up to you (and a friend in co-op mode) to shoot your way through six levels of ferocious run-’n’-gun mayhem and send these mutant monstrosities back to the stone age.