Just not on the PSP.
It was terrible. Input lag made dodging enemies impossible, and the PSP lacked the second analog stick (you had to map camera/block to the face buttons). It was a novelty, not a viable way to play. Method 2: The Fan-Made "Demake" (The Legend of Castle Crashers PSP) This is where the keyword "Castle Crashers PSP" gets interesting. In the underground homebrew forums (like Wololo and GBAtemp), a dedicated fan developer created a demake —a stripped-down, original version of the game built from scratch for the PSP’s hardware. castle crashers psp
Keywords: Castle Crashers PSP, Castle Crashers homebrew, PSP beat em up, The Behemoth PSP, Castle Crashers remote play. Just not on the PSP