It's like Ana Paintball... With LASERS. On the MOON.
This gamemode is very movement focused. There is reduced gravity, you can double jump, you can conserve your momentum and bounce off the ground by holding jump when you land (holding jump+crouch converts more of it to forward momentum), you can bounce away from walls by punching them, and throwing your nade sends you backward.
Shooting sends out a laser that can bounce off walls up to 10 times and is an instakill (as is every other source of damage in this game). You have to reload between every shot unless you are ulting, but hitting a sleep dart reloads for you.