Wait,are we talking about Zero Wing (All your base are belong to us) or Castlevania II:Simon's Quest (What a horrible night to have a curse)?
Zero Wing,I've never played either,but it looks like a cool 2D shooter
Castlevania II,on the other hand,just sucks.This guy explained why really well: https://m.youtube.com/watch?v=V4we8iFk-fY