I really enjoyed how claustrophobic it felt initially, was genuinely really compelling. However, I felt like it threw away its creepiness near the end too much by going too occult. Had you just kept the player in that unnerving state for longer, I think it would have been exceptional. Also, I imagine people will have very differing views as to whether this can really be considered in keeping with the restrictions.
great fun though, please make more horror!