I want to clarify first off that this is not a bad game. I'm not recommending it not because it's a bad game, but merely because it offers nothing over other games in the genre. It is, in almost all respects, perfectly average and mediocre. Were it priced a little more reasonably I might recommend the game in spite of its shortcomings, but $40 for something that I would only describe as "painfully average" is a bit too much.
One thing I think is worth praising is the story. Apparently this is based on a German tabletop series akin to DnD. I know nothing about it, but the game does seem to have a great deal of backstory and lore that is only barely touched upon within the actual game, and that does breathe a little life into the story. Not everything is explained within the context of the story (you'll probably spend half of the game wondering just what in the hell a Borbaradian actually IS), but the game does provide a fairly robust codex that describes things not expounded on in dialogue. And the story itself is fairly interesting. Many of the characters were also enjoyable. I especially liked Feodor, Argus, and Solus; it is a shame that the last two are only available in the last area of the game.
That is, however, where my praise basically has to end. You're given several choices during the story, but it doesn't really seem like that has any impact on how the story plays out, at least not to an appreciable degree. Most of the choices are binary, and the only difference is whether you're a ♥♥♥♥ about what you're doing or whether you're not a ♥♥♥♥. "Banish him" or "execute him" result in the exact same ending plotwise; the character is gone and has no impact for the rest of the game. That's basically what every choice boils down to. Which of these characters do you accept as your father? Doesn't matter; either one has absolutely nothing to do after the choice. The worst of anything is the ending; I had hoped for a little more variation, but it's just another generic, binary ending. To be fair, this is not a problem specifically with Demonicon; many RPGs suffer from a similar problem.
Combat is monotonous and dull, made at times even painful because of a lack of lock-on. I can't count the number of times I cast an ice spell and Cairon threw it in a direction I wasn't aiming at towards an enemy I didn't care about. He does it with melee attacks too, which is especially egregious. If you're not going to have the character attack in the directions I'm inputting, at least give me a lock-on so that he doesn't roll across half the screen to hit an enemy I have no reason to go after. There are several points in the game where you'll face summoners constantly bringing in new enemies and all you want is to kill them but Cairon keeps going off trying to hit some damned small fry who's just going to be replaced even if it dies. And that's awful.
At least, however, that adds some element of difficulty. I played through on Normal and the game is just pathetically easy. I apparently got an achievement for not using any potions throughout the entire game; I wasn't even TRYING to get this achievement, there's literally just no need for the things, at least on Normal. Doubtless the game is harder in one of the other difficulty modes, but it should bear mentioning, shouldn't it, that throughout the entire game I didn't need even a SINGLE healing potion? Perhaps allowing Cairon to heal by attacking was a bit too much. As long as your combat multiplier is high enough (hit enemies without them hitting you, basically), every attack heals Cairon for a fairly substantial amount of health. Since almost every enemy in the game has hitstun from being hit, and Cairon can roll indefinitely and is invulnerable during these rolls, it's child's play to rack up a large combat multiplier and just heal, heal, heal.
The camera, for the most part, is fine, but there are a few sections where it gets in the way. There was one section in a building in Kreutzer Alley where the camera was so bad I literally could not see what I was doing and nowhere I could move to fixed it. I simply had to mash the attack button until combat ended and then I was able to move to an area where the camera was not so screwed up. I have a feeling this was due to the relatively low ceiling in the building, and this WAS the only place in the game where the camera screwed up to such a degree. As I said, for the MOST part, the camera is entirely serviceable, but when it screws up it's very noticeable.
I honestly can't remember any of the music except for the battle music. That means it didn't stick out, which means it was neither offensively bad nor enjoyable. I actually did like the combat music at the start, but since combat takes so long and there's so much of it I tired of it a few hours in. The sound direction is also fine, although there were a few cutscenes in the game where the sound cut out entirely. It did fix itself once the scene switched, however.
I would have liked some greater ability to customize Cairon's equipment. Early on you have a fair number of choices and you can mix and match them, but later on all you seem to get is equipment sets which cannot be broken up; you either have to wear the entire set or none of it. It's a little disappointing. There are only two weapon types, bladed and blunt (axes are, for some reason, considered blunt weapons, which is as mystifying here was it was in Oblivion). There are also throwing weapons, but I hardly used those as there was little point using them over your ranged ice spell. There are some interesting weapon and armor designs. You can use weapon/armor enhancements to beef up your equipment, but so far as I can tell there's no way to remove them.
I do have a bit of a problem with how often you're sent running back and forth and how often environments are reused. About a quarter of the way through the game you're given access to the Market and Kreutzer Alley; learn to love them because you'll be running back and forth between them for the next few hours. You start the game in Moloch Mountain, about halfway through the game you're sent there again (and you have to open all of the gates again; who closed them?), and then at the end of the game you're sent there AGAIN. And you have to open the gates AGAIN (although there is a reason for the gates being closed this time). The monastery, the last original area in the game, has two main sections and a courtyard between them; you're sent running back and forth collecting gems and I began to truly despise that courtyard because of how often I had to run between sections. That entire area felt rushed, actually.
The last thing I want to mention are the bosses. They're major letdowns. Only one boss in the entire game killed me, and that's merely because he heals himself four times throughout the fight. This is largely a symptom of the general easiness in combat I mentioned earlier; you see the boss's attacks (of which they generally only have three or four, all heavily telegraphed), dodge them, and rack up your combo multiplier allowing you to heal directly as you deal damage. If you use Demonic Aura, increasing your attack and movement speed, it becomes even easier.
At $40, I just can't recommend the game. I bought it for a heavy discount during the summer sale, and I wasn't ENTIRELY dissatisfied with my purchase, but if I had spent $40 I surely would have been. If you're hard up for an action RPG, this isn't the worst choice...but it's definitely not the best, either.