Upon completing all of the stages under "Treasure's Best" in free mode, a brief cutscene will play, with one of the characters saying, "We're only here because the fanboys would throw a fit on the internet if the game didn't have an ending."

In a rare breach of the company's usual secrecy about future plans, developer Yoshiyuki Matsumoto first hinted at a sequel to Bangai-O in a 2003 interview on Sega's website to promote the game Astro Boy: Omega Factor.

Treasure handled the localization for the game in-house, adding features they did not have time to include in the Japanese release.

The player is also able to choose two EX weapons from a list of homing, napalm, rebound, break, direction, reflector, and freeze.

While dashing the player moves forward faster than normal and is able to both damage and travel through enemies and scenery but cannot fire.

[7] Eurogamer called it "glorious, eclectic, furiously inventive, dizzying, baffling, confusing, witty, clever and beautiful.

[10] Edge gave the Japanese import nine out of ten, saying, "While certainly being Treasure's most fragmented game, there's a sense that the lack of narrative, character and even proper framework makes this its most raw, pure and delightful.

"[20] GamePro said of the game, "It's obviously aimed squarely at the hardcore DS gamer; and while the intense action and high difficulty will probably turn off the casual crowd, it's a solid shooter for anyone who's looking for a challenge.