It could've been fun if it were 15min long but it becomes repetitive and boring after a while. I haven't seen performances in other theaters, may be they are more interesting.
Basically, black light theatre is a one-trick pony. It needs to be clever and creative to hold visitor's interest. I don't think this particular show does it well.
It's not clear who is the intended audience. The first half would be fun for young kids but the second half is adult in nature.
The best part is the last few minutes when they show how black light theater works.
My recommendation - try a performance in another theater.