
The iOS version, a "universal" app compatible with both iPhone and iPad devices, was distributed through the App Store, arriving first in New Zealand. The game launched for Android and iOS on September 15, 2011. Two trailers were published: one in July 2011 to demonstrate the gameplay, and another in September to coincide with the launch. A free demo was playable on the promotional website for Serious Sam 3: BFE, starting in July 2011.

An early version of Kamikaze Attack! was exhibited at the PAX East trade show later that month. The Serious Sam Indie Series was announced by Devolver Digital in March 2011. A Windows Phone port was not considered because Unity did not support the platform. Kamikaze Attack! was designed to run on the Android and iOS mobile operating systems. Though production had been planned to last two months, it was finished in six. The studio was given substantial creative control, only receiving feedback on the visual design for Sam. They also implemented role-playing elements, such as character upgrades, but removed them after playtesting showed that they served no benefit. Be-Rad intended to keep players engaged in their game longer than in others in the genre by putting in objectives and boss fights. Its art assets were hand-drawn with colored pencils by Stephan Royer. Johnson repurposed some code from Lame Castle, which allowed him the time to add further features and apply polish to Kamikaze Attack!. Kamikaze Attack! uses the Unity game engine. He also ruled out making a first-person shooter, as this genre was already covered by the main entries in the Serious Sam series. Be-Rad decided to create an auto-running game, given the experience they had gathered with Lame Castle and because Johnson thought that such gameplay would better suit mobile phones. He considered this a " no-brainer" and accepted the request. A triplet of spin-offs to be created by small studios to promote the impending launch of Serious Sam 3: BFE, the Indie Series also encompasses Serious Sam Double D and Serious Sam: The Random Encounter. After Devolver Digital, the publisher of the Serious Sam series, had come across Lame Castle, the company approached Johnson, asking him to develop a game as part of the Serious Sam Indie Series. It was Be-Rad's second, having previously released Lame Castle. Serious Sam: Kamikaze Attack! was developed by Be-Rad Entertainment, an indie game studio founded by programmer Brad Johnson. Highscores could be shared via the OpenFeint and Game Center services. "Endless" modes have no exit condition, with the player aiming only for the highest possible score through the bonus objective. Later stages are made more difficult by incorporating more hazards. Achieving these unlocks gameplay modifiers, including a higher frequency of collectibles and a faster drainage of the rage meter. Įvery level includes an optional bonus objective consisting of kicking one type of object a certain number of times. When jumping over obstacles, holding down the button prolongs the leap, and a second one can be initiated while in the air. Certain collectibles may add additional lives, others can instantly empty the rage meter, reset the character's speed, or add multipliers to the score. The Headless Kamikaze has multiple (initially three) lives depleting them causes the player to lose. It automatically drains while not in use.

These may be avoided by bouncing over them, and some can be destroyed or deflected using the kick ability, which fills the "rage meter" that can ultimately kill the character. Inbetween, the Headless Kamikaze faces several hazards, including cacti, frogs, rockets, bombs, grenades, gaps, and fences. The primary goal is chasing after and defeating Sam "Serious" Stone (the protagonist of the Serious Sam series) after surmounting a pre-determined distance.

In each, the character traverses a two-dimensional world in continuous motion. There are forty levels, split between a desert and jungle environment. It puts the player in control of a Headless Kamikaze (or Beheaded Kamikaze), a decapitated humanoid figure wielding bombs that acts as an enemy in other Serious Sam games. Serious Sam: Kamikaze Attack! is an auto-running game in a similar style to Canabalt and Robot Unicorn Attack. The objective is to strike Sam with deflected hazards.

The player character (left) chasing after Sam.
