Still exceedingly early in development.
You are a demon from hell, with untold power.
You have 2 options: Side with the invading army from hell,and enslave all of human kind.
or
Side with the humans and thwart your master's plans.
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Edited by: The_Shadow, Feb 24th, 2015 @ 8:00 pm

I'm sure looking forward to it!!

this reminds me of shin megami tensei in that there's the option to side with the demons or with the humans, to say nothing of the thematic resemblances.

what's the concept for how it'll play?

It's still very WIP, but here is what I have so far.

Effectively, something like Contra and Double Dragon.
Your goal is to complete one of two objectives in a given level. this objective can vary in nature, though the objective will play a large factor in your chosen path.

You can also choose your side by simply killing targets, be they demons, or humans.

Innocents are another factor, as there are some on both sides.
This function, if all goes according to plan, will have a high level of control, as well as the option to disable entirely.

Your goal in the demon path is to enslave humanity, so killing innocents can cause problems by nature of the storyline.
Options for this function will include Penalties to score, lives, credits, or reversing it to rewards, causing them to drop powerups, and adding to the score.

Weapons may include guns, swords, and makeshift weaponry (Such as using a flatbed truck for a club)

Collateral damage is inevitable, however some side bonuses may be awarded for damage caused VS damage prevented.

There is also a factor of rage.
Rage works in reverse to your current health, causing you to deal more damage, move faster, and when near death, unleash your ultimate power in "Demonic Rampage Mode" rendering you invulnerable for a short time, and largely increasing the radius of your standard attacks.
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Edited by: The_Shadow, Feb 25th, 2015 @ 11:15 am

Quick note on character names:
Spun the following off the top of my head, the names may change, or they may not.

Player: Damian Valkier (Human)
Special ops (Undefined) Military.
Fell in combat.
Sentenced to eternity in hellfire for his violent nature and lust for power.
AKA: "Red Titan" (Satanic Demon) due to his red skin color, and enormous size caused by his demonic transformation by the hands of Satan.

Antagonist: Satan (Demon lord)
(Self explanatory)

2ndary Antagonist:
Lucian Devilson (Human)
Terrorist leader, with motives unknown to even his own minions.
In league with Satan to enlist more allies to hell's army, by any means possible.