When I think "High Velocity" I think of Pool Balls, Trick Shots, and other things dealing with controlled high velocity. Maybe make a game where you have to aim a projectile through a course and select the proper velocity to get it through.

Advanced versions could include multiple projectiles with different launch times, velocities, etc... So you cause a ricochet against projectiles and environments.

Not that I have time right now to compete, but there is my idea

- Jeremy