Alienation is an action role-playing shooter video game developed by Housemarque and published by Sony Interactive Entertainment for the PlayStation 4.

The game is an isometric twin-stick shooter in which one to four players defend themselves against an alien invasion on Earth through increasingly-difficult levels.

It received generally positive reviews, with praise for the twin-stick elements and cooperative multiplayer feature.

[8] When a player accumulates enough experience, they "level up" and can spend points on three active and three passive abilities, chosen from several options on a trio of skill trees.

[1] When Alienation's story mode is completed, the player unlocks missions with bounty-like assignments and quests with special items as rewards.

Alienation was developed by Finnish video game company Housemarque and published by Sony Interactive Entertainment.

He noted the chance of references to other Housemarque games, similar to how the incorporation of Resogun ships into Dead Nation.

[10] In April 2015 the developers released details about Alienation's gameplay, saying that it would feature three character classes, and "plenty of loot and a ton of weapon customization".

[17] Since Alienation's release, Housemarque has updated and added downloadable content (DLC) to the game.

[18][20] Weekly missions were introduced to give players an additional challenge, with another difficulty level also added.

[1] Matt Miller wrote for the video-game magazine Game Informer that in multiplayer mode, Alienation had some of the best twin-stick shooting gameplay available.

[4] According to Ben Tyrer of GamesRadar, although the game's maps might not be memorable, its twin-stick shooting mechanics and design were.

On GameSpot, a video-game news website, Jason D'Aprile praised Alienation's cooperative gameplay but was frustrated by the lack of a local mode, though he said that "with a full troop online" the game was "easily one of the best all-out action multiplayer games in recent memory".

[2] In David Jenkins' review for the British news site Metro, the co-op was "fun no matter what".

[22] Although GamesRadar's Ben Tyrer enjoyed the game, he also believed that it would benefit from having a "tense, pad-crushing, couch co-op" feature.

[2] Although Metro's David Jenkins found its creatures' design "uninspired", the game's overall graphics were decent.