SHFSRR is a 2D arcade-style game. The player controls two avatars and can move with them on three lanes. Two types of randomly spawning objects will come in from the right side of the screen. One avatar gains score from one of the objects, and loses score from the other and vice versa.
W and S control the Shark Avatar, Up Arrow and Down Arrow control the Runner Avatar. Staying close will increase your score, but getting too close is a bad idea.