Velocity is a multi-player Quake-like I am currently working on, made with Unreal Engine 4. In Velocity, the main movement mechanic is a grappling hook which allows players to move quickly and freely both horizontally and vertically. It is played in a 1v1 Chase-Tag inspired game mode.
While I have received help on the graphics, Velocity is mostly a solo project and I handle both Game Design & Programming:
Velocity is available to play (but still in development)!