Single-player games like Hallo Spaceboy
Below are 10 single-player Steam games similar to Hallo Spaceboy, 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 Hallo Spaceboy page.
Ranked picks
- 1
Intrusion 2
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
"This is some of the most fun I've had with a game so far this year, and it will go down as one of the best side-scrolling shooters of all time." - 9/10, Destructoid
- 2
DRAINUS
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
This is a side-scrolling shooting game in which you take control of the "Drainus", the Kharlal Empire's most cutting-edge fighter with the ability to absorb energy bullets, and take down the enemy ships zipping through space.
- 3
Project Warlock
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
Project Warlock is a first-person shooter that fans of Doom, Hexen, and Wolfenstein cannot miss. It serves you an exploding cocktail of bullets, spells, and monsters. Battle through 60 levels of non-stop action, packed with bloodthirsty enemies and challenging bosses.
- 4
Downwell
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
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.
- 5
Deathwish Enforcers Special Edition
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
A gritty, non-stop blood bath from the creator of Insanity's Blade, Super Battle Princess Madelyn and the recently released GuardGrave. And a parody of beloved 60s and 70s classic action films, heroes and villains. Deathwish Enforcers... There's gonna be hell to pay!
- 6
Good Robot
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
Good Robot is a fast-paced roguelike shoot-em-up that pits you against thousands of robots out to violate your warranty. Explore a procedurally generated sci-fi metropolis and the depths of corporate depravity, but never stop shooting...unless, of course, you're a Bad Robot. You're not, are you?
- 7
Naval Warfare
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
As Commander of a Naval Super-Destroyer, wage war in a military campaign of epic proportions in, under and above the surface!
- 8
Tadpole Treble
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
Embark on a thrilling adventure through sheet music in Tadpole Treble! Escape predatory piranhas, flirtatious tadpoles and more as you make your way back home. Shoot for the top of the leaderboards, or create your own stages and music in Composition Mode!
- 9
Jelly in the sky
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required. Shares Action with Hallo Spaceboy.
Experimental approach to 2d artillery genre: everything is realistically destructible, because the game world is a physics simulation. There are no sprites in the game. All you see is made of dynamically simulated matter, and thus can be destroyed. This innovative approach opens the new layer of physics based gameplay features.
- 10
Mines and Magic
Single-player alternative to Hallo Spaceboy — playable solo, no multiplayer required.
Multiplayer tower defense auto battler with economy. Combine unique abilities of your units. Expand territory and build mines to get resources. Find a balance between economy and army. Use spells to help your army. Relaxing, but challenging singleplayer campaign is available.