Just so You know, I know very little about this game, but that does n t mean I will not try my best to inform you about this amazing looking game.
Castle Crashers is a 4-player beat-em up adventure game brought to you by the company "The Behemoth". If you have ever played Alien Homidid or Dad and me via Newgrounds, you will instantly recognize the awesome art style that this game uses. I will now break up the basics of what I know.
Characters: Before You start each game ( As of now I don't actually know if you can save your process) You and your friends will pick a character that you will start with.

As of now, the characters you see below are the only ones that are known to be in the game as of this moment. I don't know much more about this, but here is some information about the characters that are listed:
- Red Knight - Can perform lightning attacks.
- Blue Knight - Can perform ice attacks.
- Orange Knight - Can perform fire attacks.
- Green Knight - Can perform poisonous attacks.
- Periwinkle Knight - Carries a lightsaber-esque sword.
- Bear - Wield a giant fish.
- Saracen - 'The only middle eastern character in the game.'
- Thief - Steals stuff.
- Brute - Can make thorns appear from the ground.
- Ninja - Fires shurikens and uses a mug for defense.
- Skeleton - Because every game needs one.
- Royal Guard - Has a devastating arrow attack.
- Killer Beekeeper - Can send killer bees to attack enemies.
- Alien Hominid - Attacks with a plasma gun lance. Is automatically unlocked for people who downloaded the full version of Alien Hominid HD.
That was all taken from the wiki on the game as of this moment.
Gameplay: As you know in most beat-em-up games, the point is to get through the level and get to the end and beat the boss of that level. At the center of this game, it really is no different, but don't let that fool you. The creators of this game wanted this to truly be something different, so they went all out to try and make this game a truly unique experience for you. Here is what I know that they have implemented.
Unique Combo System: I don't know much about how this works, and how you can string moves together, but within the videos I will show you will be able to get a basic idea of how this is going to work.
Animal Orbs: Basically, these will provide enhancements for your character along with bonuses. Here are the animal orbs that have been unviueled on tthe site so far...

There is no list of desvription for what each one does. If you want to know what each one does on this list so far, you will have to check out the developers blog link that I will provide at the end.
40+ weapons to find and train with: This is basically self explanitory. There are multiple weapons that you can find throughout the game to use and train with.
20+ levels and bosses: Also self explanitory
Basically for gameplay, this is really all I know. I will now show you some pictures and will link a few videos so you can see this game in action. Hopefully I have caught your interest and you will look forward to this game as much as I do. If you have any more questions about this game, feel free to ask, but your best bet is to go
here and check out the developers blog. Happy gaming everyone!

Arigh these pictures are not doing justice...instead check out these movies.
Movie 1
Movie 2
movie 3(The links are now fixed, I apologize)