An incredibly weird film, marred not by its corniness but by not being very well made. The setting is wrong, KISS are a bit too aloof, the villain isn’t correctly targeted and we have no interesting secondary characters.
I think you could make a really fun movie out of group of rock stars who secretly have magic powers and are targeted by a super villain. And you could include plenty of songs as well as concert footage. And it could be camp; in fact it probably helps if it is.
There is a real commitment to making KISS these other worldly figures here: they only become characters like half an hour into the movie, they immediately have magic powers and it is not initially explained, they dress up in robes while sitting around a swimming pool, and Gene Simmons talks throughout the entire movie with an echo effect on his voice as well as barks like a Demon.