An app called Boris And The Dark Survival is currently free on Android devices for a short time.
The expiry date is unclear, but it is not permanently free. It is yours to keep forever if you download it before it expires.
This game is available on Apple devices as well, but the free giveaway is only for Android devices.
Store Description:
Play as Boris the Wolf, the cartoon companion of Bendy, as you hunt throughout the abandoned cartoon studio for the supplies Boris needs to keep going. You’re not alone! The monstrous Ink Demon stalks you at every turn. Beware the sound of his beating heart as he creeps up from behind and catches you in his dripping gaze. No where is safe. Yet secrets lie in wait for those adventurous enough to seek them out.
Click here to get the game app from the Google Play store for Android devices for free.