Holo Impact: Prologue has just been released on Steam for HTC Vive! It is developed by Redstorm Digital Studio, a game development company based in Taiwan.
Holo Impact: Prologue is described as a space arcade shooting game, and the player has to rescue his girlfriend, who has apparently been kidnapped by alien.
Holo Impact: Prologue features various weapons for use, such as a plasma gun, tracking missiles etc. This game is developed by Unreal 4 Engine, and requires a standing/room-scale play area.