Constructed originally as a test of a new movement and a new firing strategy for Fusion?
It so happened that Neptune was a good bot in its own right.
Uses FluidMovement - that is partly the reason for the name - Neptune is king of the sea. Neptune is also a planet, seemed good to continue the tradition from Saturn
The FluidMovement also incorporates ShrapnelDodging to avoid bullets.
The firing used is LaserTargeting
The only difference between melee and one-on-one is radar control as far as I remember.