The iOS adventure game will arrive on September 21
The Unreal Engine 3 game will also be optimised to run on the newly announced iPod Touch and iPhone 5.
"We are extremely excited to be able to bring Lili to new iPod Touch," BitMonster president Lee Perry said.
"On the stunning 4-inch Retina display we are able to create a truly cinematic hand-held experience. The new graphics hardware allows us to bring a visual fidelity that is unmatched and we can't wait to share this amazing new character with the world."
The game stars the titular heroine Lili as she explores a mysterious island of Geos and its robotic inhabitants.
It is described as a combination of role-playing and adventure mechanics, with a unique "non-combat" approach to dealing with enemies.
BitMonster is a new studio founded by six former Epic Games developers who had worked on titles including the Gears of War trilogy, Unreal Tournament 3 and Infinity Blade.