Ikaruga (2002)

Changing polarity turns some enemy bullets into energy, so the screen becomes a pattern to interpret rather than simply something to dodge. The Dreamcast conversion arrived in Japan in 2002 after the arcade original, making this an import release rather than a worldwide launch-era exclusive. Current PC and Switch editions are easier routes to the same core idea. Use a lower difficulty while learning the five stages; absorbing one colour does not protect you from the other, and chasing perfect scoring chains is a much harder second project.