FYI: Deal ends in around 20hrs from when I made this post.
Alternatively, the base game is available for $2.99. The Shadow Edition comes with the Nightfall expansion.
This game also supports cross-platform coop and has a level-editor to share new missions.
Steam link for reference.
You are Aragami, a vengeful spirit with the power to control the shadows. You’ve been summoned by Yamiko, a girl imprisoned in the city fortress of Kyuryu. Embark on a dark journey full of blood and secrets to discover the truth about aragami. Infiltrate the occupied city of Kyuryu with your supernatural powers and fight Light with Shadow. Uncover a story about twin souls bound together by destiny that surpasses time and memory.
EMBRACE THE SHADOWS
Create your own shadows to become invisible. Teleport from shadow to shadow while you hunt down your targets. Use a wide array of Shadow Powers to creatively dispatch your enemies.
CHOOSE YOUR PLAYSTYLE
Multiple paths to beat each scenario and approach every situation. Play as a merciless emissary of death or an undetectable ghost. Your story, your choices.
Fight Kaiho, the army of Light, and rescue Yamiko – the mysterious girl that summoned you and that is the key to your existence.