What a great game! It’s just like Metroid or Castlevania in structure, only in a near-future setting and in 2.5D.
It took me just over 6 hours to complete, and I enjoyed every minute of it. Part of the appeal of these sorts of game comes from starting off weak and useless but building your powers and stats up to become unstoppable – defeating with ease the baddies that previously seemed indestructible. Another thing I like is the OCDness of it – collect everything, visit everywhere. Get 100% on your skills and stats. I’ve completed the game, but I’m not there yet so there’s still plenty to be done!