Single-player games like Defendor
Below are 8 single-player Steam games similar to Defendor, 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 Defendor page.
Ranked picks
- 1

Spacey Vade
Single-player alternative to Defendor — playable solo, no multiplayer required. Shares Action with Defendor.
Synth-wave styled physics based 2D puzzle shooter filled with nods to the golden era of classic arcade games. Think upside down Peggle crossed with Space Invaders and enemies crafted from the blended remains 70's, and 80’s gaming.
- 2

Ultra Mission™
Single-player alternative to Defendor — playable solo, no multiplayer required. Shares Action with Defendor.
Embark on a dangerous investigation in Ultra Mission™, the latest game by Gumbo Machine™. As an agent of the Stellar Exchange Commission, you must traverse the 20 dizzying levels within Otto Labs, each littered with powerful automatons and questionable experiments. This is going to be a blast!
- 3

2nd Shot
Single-player alternative to Defendor — playable solo, no multiplayer required. Shares Action with Defendor.
In the vast depths of space, lies a man with a dark past. Setting himself apart from that old life, and seeking justice against wrongdoing instead of being the cause of it, Captain Righteous uses the Freedom Fighter, his trusty space fighter to search for and combat the evil Captain Buster!
- 4

Frenzy
Single-player alternative to Defendor — playable solo, no multiplayer required. Shares Action with Defendor.
In this simple riff on an arcade classic, released in 1983 for the ZX Spectrum by famed game developer/publisher Ocean Software, search labarinthine levels for the exit, while surviving an ever-increasing onslaught of deadly robots.
- 5

Dead End City
Single-player alternative to Defendor — playable solo, no multiplayer required. Shares Action with Defendor.
A post-apocalyptic arcade shooter. Collect fuel and dodge enemy fire as you fight back against the evil Scorpio gang. Mixes cars, shmups and themes that would have been right at home in 80's anime and arcades..
- 6

DoDonPachi Resurrection Reignite
Single-player alternative to Defendor — playable solo, no multiplayer required. Shares Action with Defendor.
CAVE's arcade bullet hell shooter returns as DoDonPachi Resurrection Reignite. New stages, a new character, new music, and other new elements set the stage for a new challenge.
- 7

Martian Invaders
Single-player alternative to Defendor — playable solo, no multiplayer required. Shares Action with Defendor.
WE HAVE ALIENS, YOU DON'T—Blast Martian invaders and flying saucers across 30 stages with robotic voice effects. Use your destructible shield, rescue army men for bonus points, and chase the high score.
- 8

Netherspace
Single-player alternative to Defendor — playable solo, no multiplayer required. Shares Action with Defendor.
A sci-fi shoot'em'up game with heavy focus on upgrades experimentation, featuring two unlikely heroes that must work perfectly together, despite their share of secrets, to surpass their limits and succeed in eliminating a threat that might destroy both Earth and Andraxia if left unchecked.