Seven Leaf Clover, the Argentina-based studio behind the upcoming first-person action game Rebel Engine, has announced an exclusive collaboration with Hololive English -Promise- member Hakos Baelz. The partnership features an original soundtrack composed and performed by Baelz, which will debut in the game’s Steam Next Fest demo from October 13 to 20, 2025.
A Fusion of Chaos and Speed
Rebel Engine blends ’90s-style FPS speed with hack-and-slash melee combat, delivering a mix of explosive gunplay and blade-based precision. The new collaboration builds on that energy, with Hakos Baelz’s signature chaotic, high-tempo style powering the game’s soundtrack for the first time.
The track will be featured exclusively in the Steam Next Fest demo, giving players the first taste of the game’s rhythm-driven intensity combined with Baelz’s creative flair.
VTuber Meets Indie Game Soundtrack
With over 1.09 million YouTube subscribers, Hakos Baelz is one of Hololive English’s most popular talents, known for her energetic performances and eclectic musical style. This marks her first original video game soundtrack, expanding her reach into indie gaming while connecting two fast-growing creative spaces: VTuber music and independent game development.
Play It First During Steam Next Fest
The Rebel Engine demo featuring Hakos Baelz’s music will be playable during Steam Next Fest (October 13–20, 2025). Players can wishlist the game on Steam now to be notified when the demo goes live.
