Played through it a while ago on a long weekend rental. Great style, killer soundtrack (if you like rockabilly/psychobilly), but it needed more polish and variety overall. Too much reliance on slo-mo and QTE. The workings of a better game are there, but the developer didn't deliver for whatever reason. Still a fun "get drunk and shoot dudes" experience for one playthrough, though, which is what I expected.
If you liked the demo, rent the game. Definitely not worth a purchase for anything more than say $10.