When comparing Alien Swarm vs BattleBlock Theater, the Slant community recommends BattleBlock Theater for most people. In the question“What are the best 4-player local multiplayer games on Steam?” BattleBlock Theater is ranked 16th while Alien Swarm is ranked 26th. The most important reason people chose BattleBlock Theater is:
There is a modified co-op campaign that requires players to coordinate their actions to succeed. This makes it a fun couch co-op game due to the importance of communication (as well as how fun it is to grief your teammate in person).
Specs
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Pros
Pro Easy to pick up and play, even for beginners
The game consists of tried-and-true top-down shooter mechanics that will be familiar to most players; it is reminiscent of older arcade and console shooters.
Pro Anyone can download and play the game as it is free-to-play and open-source
The game is completely free and has no microtransactions or ads.
The source code is also free and accessible, so the game can be easily modded.
Pro Easily play with up to 4-players in online co-op
Alien Swarm allows for up to 4-player online co-op, which makes for an easy way to play with a small group of friends or strangers.
Pro Convenient offline LAN support
Alien Swarm offers offline LAN (local area network) support, meaning that the game can be easily played locally with each machine connected together in the same place.
Pro Co-op adds a completely new element of coordination to the gameplay
There is a modified co-op campaign that requires players to coordinate their actions to succeed. This makes it a fun couch co-op game due to the importance of communication (as well as how fun it is to grief your teammate in person).
Pro Thought-out presentation that balances style and humor well
The witty humor, enjoyable songs and cutscenes all demonstrate the high level of care and consideration that went into BattleBlock’s design. These things all add up to a game with polish that still stays unique enough to stand out.
Pro Good mix of co-op and PvP multiplayer modes keeps the game enticing
The 2-player co-op campaign is very similar to the single-player one, except that it requires cooperation between the two players. It can be played online or with 2 local players. There is also an arena mode with competitive levels that supports up to 4 players (local, online, or mixed). This gives a good variety of online and local play modes, which should keep the game fresh.
Pro No difficulty spikes, the game is very well balanced
The difficulty curve for Battle Block Theater is so evenly programmed that the player will barely notice things are getting harder. It really does an impressive job of training the player to handle any challenge the game throws at them.
Pro Endless replayability through the level editor and its easily sharable creations
The game has a built-in level editor, and levels (or level packs) can be shared through the Steam Workshop. This makes for a situation where there is an inordinate amount of content for the player to try out, or even create themselves.
Pro Sort of funny but not too much
Light hearted gaming that you can play with your significant other.
Cons
Con Can get a bit repetitive
The gameplay doesn't change much from mission to mission; you’re generally just shooting aliens over and over again.
Con Gameplay is too short
The main story only takes about three or four hours to complete, which means you could beat the game in one sitting pretty easily.
Con Competitive play feels lackluster
Competitive play is not as enjoyable as the co-op modes due to stiff combat. The mechanics of this wear out pretty quickly.