Interesting
First of all, I want to back up your comments. Who gives a crap about whether this is based off DMC or not? People can argue that Alien Hominid is nothing more than a Metal Slug rip-off, or that Alkie Kong is obviously a Donkey Kong clone, or even stretch the imagination enough to argue that Tactical Assassin is just a watered-down version of Silent Scope. Seriously, hundreds of examples exist on the internet. But the point is, what you were trying to do is a great idea, and shouldn't be criticized since it falls into the same category as at least 60% of all other Flash games out there. However, there are other points to consider. And while I normally don't write FULL reviews, I'd like to cover all that there is about this game.
Gameplay
First of all, the controls are EXTREMELY sluggish, chaining combos and switching weapons excluded. That you actually did pretty well with. But jumping feel so awkward, seeing as it's nigh impossible to steer yourself about as you come for a landing, leaving you open if you jumped too soon. The other moves such as rolling and back-flipping are a nice touch. But again, the combo system seems weird. I can just launch an enemy into the sky and keep chaining until I leave the top the of the screen, only to drop back down, unable to defend myself, and get my ass handed to me.
Sound
The music's good, and the sound effects are very good.
Graphics
The graphics are decent, but the animation seriously needs some polish. The enemies floating around don't move much, and just seem like paper target that strike back if you stand there long enough trying to remember which button to push. The animations form flipping seem a bit weird, definitely need a bit more attention to those. But, you've got them working, so polish is a point that can come in a future re-release. ;)
Story
It's good, and I like the comic-book approach to the cutscenes you used.
Challenge
There is definitely challenge in this game. Sadly, the experience is only bogged, and the challenge increased, by the controls. As I mentioned before, jumping is very sluggish, and god forbid if you get caught between two enemies and can't remember to dodge.
Summary
All in all, a very decent effort at giving the fans more of a great series. I think it was a very novel idea, but the controls might turn away some of the less dedicated players. I know I'll be striving to unlock those medals. Final score: 4/5