If you took the core mechanics, added some more complex melee combat and change the over all theme to ninja, how great would a Tenchu game be based off this engine.? As I played it that was my thought on how fun a Tenchu game controlling like this would be. Great game by the way, love every moment from start to finish.:)
I even thought Rachet and Clank: Deadlock when it came out, would have made a great template for an updated Contra game. You have co-op, special weapons, platforming, lots of enemies, and big bosses.