I played it, and honestly, I just don't see the appeal. The only challenge is to complete the level in par time, and that's something I never cared about in games. Maybe there would be a better incentive if the shooting felt more impactful, cause right now it looks and sounds kinda weak. The stylized low-poly models with no texture filtering look nice, though.
Also see no reason in using shotguns cause you need to cock them after every single shot.