Turrican (USA) ROM

Turrican is a 2D side scrolling action platformer where the player controls the titular character as they traverse treacherous platforming obstacles while shooting down enemies. The gameplay is very similar to games like Metroid or Psycho-Nics Oscar and players can pick up power ups that change their shots to spread shots, lasers, and so on. Levels are quite large with tons of enemies and environmental hazards. You can even change into a faster version of Samus' morph ball from the Metroid series. Turrican was released on several different systems as well which all had slight variations from each other.

A port of the original Commodore 64 classic (or, more particularly, the Amiga version), it's fairly faithful in its material aside from a rather sloppy take on the legendary Chris Huelsbeck's soundtrack and some awkward controls. Otherwise, it's a pretty standard shooter platformer in all but level design - which goes for large, sprawling and maze-like, with obvious gameplay and stylistic homages to Metroid. Be prepared to die a lot, though, because this was a time where difficulty was unforgiving and lives can be found and lost in abundance.