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A non-linear sci-fi action game developed by Nihon Bussan. The Famicom version additionally had light RPG elements, but it was never released outside of Japan.
Cosmo Police Galivan puts the player in control of a human being armed with a beam blade, which is only able to attack monsters in close proximity. As the game continues, the player character can use different powers - some ranged - to take out enemies and progress further. Eventually, the player will have the option of becoming a metal-armored officer with considerably more fire-power, though this power-up state will vanish if too much damage is taken. The player character will also level-up after destroying so many enemies, improving their health and "cosmo points" - a stat similar to mana that is used to power the player character's special attacks.
The game's world is a network of caves that the player can explore for necessary items and bonus areas. The NES version expands this aspect, providing some Metroidvania-esque exploration. Some impediments are in place to restrict further exploration until the right item is found, as well