Lunopolis had an interesting premise, and the writers and director show a lot of promise by telling a good, suspenseful story.
Unfortunately, the film is let down by it's obviously minuscule budget. The format of the film (documentary style) does lend itself to a low-budget production, but there are many points where the lack of cash is apparent enough to pull you out of the story.
For one thing, there are a few brief special effect scenes that have zero authenticity to them whatsoever. The director would have been better off finding another way to treat the material, because a bad effect is far worse than no effect at all. Another thing that pulled me right out of the film was the scene at the cult compound. They clearly had no money for extras, wardrobe or stylists, so instead of a scene featuring intimidating, creepy, authentic-looking security guards in black suits (as intended), you have a couple of dorks in cheap sunglasses and clothes that don't fit, trying their best to look tough (and failing). It was pretty bad.
Anyway, as I said, it's an interesting film. I do wish they had the money to execute properly though, because it could have been much, much better.