Sine Mora, a side-scrolling shooter for the masses (review)

Sine Mora inspires a certain amount of wondering about what a 2D shooter really needs in the way of production values. Does it need an original soundtrack by a big-name composer? Does it need an extensive, otherworldly backstory? Does it need an elaborate time-travel plotline about saving someone’s life in the past and avenging his death in the present? Does it need poetically-written cutscenes and voice-overs delivered in Hungarian?