When comparing Alien Swarm vs Castle Crashers, the Slant community recommends Castle Crashers for most people. In the question“What are the best Online Co-Op games on Steam?” Castle Crashers is ranked 5th while Alien Swarm is ranked 15th. The most important reason people chose Castle Crashers is:
Each level in the game has its own look and design which can keep the gameplay varied thanks to creating a need to explore in order to see what comes next. Ranging from deserts to ice filler terrain, there is no level that looks the same.
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 Successfully avoids becoming repetitive and boring
Each level in the game has its own look and design which can keep the gameplay varied thanks to creating a need to explore in order to see what comes next. Ranging from deserts to ice filler terrain, there is no level that looks the same.
Pro The gameplay is very lighthearted and amusing
There are several jokes and silly moments throughout the game. All done without speaking any word. This keeps the game lighthearted and amusing thanks to the humor of the creators and how they infused it into the game itself.
Pro Supports co-op up to 4 players
The most fun to be had with the game is during four player co-op play. The unlockables and upgrades also keep the player wanting to come back and play just a bit more with their friends.
The co-op is available as local and online.
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 Bugs that appeared in the original XBox title were not fixed for the PC port
There are still bugs and glitches in the game that were in the original XBox version. Even though there were simple fixes for some of these the dev nor publisher bothered to address them.
Con Fair amount of grinding
There is a good amount of grinding that will need to take place for players to be able to advance past certain bosses.