Vertical Force is another of the third party releases for the Virtual Boy.
It's a vertically scrolling space shooter, and my favorite game on the system.
Multiple power ups for your ship, and a special drone system with really smooth, useful controls make this game fantastic.
There are two planes, or altitudes, in which you, your drones, and your enemies can fly. Skillful movement between these layers are key to your survival.
Climb in the Ragnarok and start flying!