Some great cinematography early on, the score is consistently nice and the creative/gory deaths are enjoyable to watch. Sadly, that's about it.
The acting in 'Tulpa – Demon of Desire' isn't the best, though I don't actually blame the cast - rather the filmmakers, who chose to shoot the majority of the film in English, despite having a mostly - if not entirely - Italian cast. The language choice makes it feel clunky and cheap.
I liked watching Claudia Gerini in the lead role, she does a solid enough job. There aren't any others I'd pick out, though. There are a few that play a big part, one in particular with the twist at the end - which is poorly executed. I do, meanwhile, give the film credit for how it mixes the sexual stuff into the story.
A bigger budget and cleverer writing could've made this great, instead it's a disappointment in my opinion.