YMMV / Xeno Crisis

• Polished Port: With up to twelve separate ports across a variety of systems (and counting, with PlayStation and Super Nintendo on the way), you'd think at least one of them might be a Porting Disaster — but owning the systems and having means to play physical copies aside plus certain limitations with certain controller types for a twin stick shooter kind of game, every single version plays as good if not better than the Sega Genesis original. While there may be some differences, such as widescreen filling the borders with game info like score, health and ammo, subtle palette alterations to work within certain system limits, and extra voice acting with higher quality samples on the later generation releases, you basically can't go wrong with any version.
• Scrappy Mechanic: Using even one continue at any point in the game will lock you out of the ending and result in a Non-Standard Game Over at the end of stage 6. Combined with the Nintendo Hard nature of the game, this basically means you're being punished for not being skilled at the game.
• That One Boss: Many Qualify.
  • Death Viper is a Segmented Serpent that covers up a nice chunk of the playing field. It fires an 8-way shot from it's tail that flies decently fast and comes out without warning. While that doesn't sound so bad, after you get it to low health, it starts getting faster and starts moving more erratically and starts firing shots from it's mouth, making it's weak point very hard to hit.
  • Cthulhu starts off shooting 2 projectiles in random directions that travels insufferably and unpredictably fast. Though it's easy to take down, it then goes into its stronger form that takes up half the screen, firing multiple enemies that bounce all over the place while it shoots giant energy balls and bolts of lightning that reduce your space to dodge things. Do this 3 more times as it switches between its forms while its attacks get subsequently faster each time.