Spiral Knights is described as 'Band together and fight to the Core! Spiral Knights is a cooperative adventure in a persistent world with a focus on instant, fast-paced action'. There are six games similar to Spiral Knights for a variety of platforms, including Windows, Linux, Online / Web-based, Android and iPhone. The best alternative is Path of Exile, which is free. Other Spiral Knights like games are Torchlight (Paid), TERA (Freemium), Drakensang Online (Freemium) and Bunch of Heroes (Paid).
Path of Exile is an online Action RPG set in the dark fantasy world of Wraeclast. We're a small independent team of hardcore gamers based in New Zealand and have created Path of Exile as the game that we'd want to play ourselves.
Torchlight is an action role-playing game. The fantasy-themed game is set in the fictional town of Torchlight and the expansive caverns and dungeons nearby, which adventurers explore to collect valuable loot and battle hordes of monsters. Represent entire series of Torchlight games.
TERA is the first true action MMORPG, providing all of the depth of an MMO with the intensity and gratification of an action game. Players fully control their characters using the game's dynamic battle system.
Heroes Curse combines elements from classic RPGs with hack and slash gameplay. Battle through multiple levels to gain character experience and rank up your Hero. Choose Heroes wisely as each has their own special abilities and flaws.