The pacing is glacial but I actually didn't mind. It's this slow build of tension and suspense, punctuated by a frantic synth soundtrack.
The vampire thing is kinda tangential, it could be any supernatural creature.
For it being so low budget, it's quite good. I think most of that is due to Zohra Lampert, her acting is really very good - she does a fantastic job at portraying the mental health struggles.
Deeply atmospheric, I just wish I'd had a higher resolution copy.