This game has a dumb generic name that only brings to mind boring people arguing about stupid shit for years and years. But the game is actually awesome, and i bet you've never heard of it. Because i hadn't heard of it and I'm pretty sure I've heard of everything, including this now. Except i didn't hear of it, i discovered it on one of my expeditions, so that i could bring it back to the world and improve all your lives just like Mary Montague visiting the Ottoman empire and bringing back the first non-dead child.
This game should really be called something more descriptive of what it actually is. Like "Run and Gun Mansion" or "Zombie Fun Run" or "Runny Gunny Fun Fun Run Fast Survival Horror Monster Blast" or something rad and stupid like that. Those are all better than "vaccine" which tells me nothing. With a name like that this could be a game about scraping cow udders for all i know. No wonder it flew under the radar.
Basically this is a combination of an old school Resident Evil 1 throwback and a modern stripped down no-bullshit roguelike, it's cool as hell. You run through the randomly generated mansion collecting keys and weapons and trying to stay alive. That's all there is to it. I love it, but maybe I'm just easily impressed by something mildly cool because most things in life are wildly uncool. But this fool's gonna go wild if you don't inoculate your child from all the shitty games out there by shoving its rotten face in this good one. I'm pretty sure that's how it works.