Toshi Tensou Keikaku: Eternal City

Eternal City is a side scrolling action-platformer game. The player takes control of powerful mecha-suit called the Argyderos piloted by the female fighter Minty Geile. She starts her journey armed with a traditional Vulcan gun but numerous weapons can be collected throughout the game. The Argyderos can also later equip a back booster allowing it to fly around the environment or dash forward at high speed.
Levels in Eternal City are vast maze-like areas with dead-ends and misleading corridors, each culminating with a boss battle.