You can do the research for the details but my point is that the Vampires in Skyrim, at their present form do not parallel the Nords. They got it half right, I should mention, as evidently the Vampires of Cyrodiil trying to usurp the Volkihar is parallel to the brewing civil war in some ways (daedra in the details). What is missing is the second Vampire strain: The Volkihar. Imagine the possible Vampire Quests! that never were...
Not only that, but it's just not fun to play a "backwards vampire". Feeding shouldn't make you weaker. You'll never see a feeding-in-combat mechanic like in the gamejam video as long as it goes backwards like that. Imagine a finisher that you can't control that strips you of your powerful vampire powers.
The one reason I never played a vampire in Oblivion (and never will in Skyrim) is because of this. If I'm a vampire I'd like to terrorize people by using my powers, charming and getting in good with them to slaughter and feed on them in the dead of night when they're asleep... or while they're out unawares, wandering away from people. Neverminding that you can't feed on non-sleeping NPCs, why would I want to lose my vampire powers by behaving like a vampire? And what good would my vampire powers be if I can't truly behave like a vampire with them?
At least with werewolves, they got it the right way around (excepting for the lack of lunar transformations, and general balancing issues plaguing the majority of the game). Turning into a werewolf and killing/feeding on NPCs replenishes health and extends your time as a werewolf, encouraging more werewolf-like behavior of killing and feeding. Then when you stopped behaving like a werewolf, by not feeding for some amount of time, you stopped being a werewolf and turned back.
It should be the same way for vampires. Killing and feeding should give you power, encouraging more killing and feeding (during which people won't like you as they'll see you as the grotesque vampire you are). After a while of not feeding, you'll lose your power and you'll start to look more normal, where people won't immediately realize you're a vampire (some, like the Vigilants of Stendarr, may still detect you regardless). It could also be made so that food doesn't restore health or stamina, only potions, magic, and feeding would.
So in my opinion, it should be that you start as a "weak" stage 1 vampire. Every time you feed, you go up a stage and get a bit more power until you reach the maximum, stage 4. At stage 4, your face will be warped enough and you'll burn enough in the daytime to give yourself away, and people will attack on sight. Wearing a cowl or full helm inside or at night would hide your vampire nature, but also prevent you from feeding until you take it off. Not feeding for 24 hours would bring you down a stage, until you're back at stage 1 after three days.