Valdis Story: Abyssal City is a good example of drawing quality out of a game through a well-oiled grounded combat system. Fighting in it rewards learning enemy patterns and conscious battling and its skill tree system doesn't hold your hand on what to get but satisfies those who like to create builds. While length might feel a little short, two playable characters with different skills and weapons (with two more on the way) help hold you for your dollar's worth. Art style is great and leaves character easily recognizable though the story comes across as a tad cliche with its angels and demons angle. At times, the dialogue and backstory veers into teenagers-RPing-on-GaiaOnline levels of corniness but it ultimately doesn't choke you with it.
To sum it up, Valdis Story is definitely worth the fifteen dollars and while it might have needed a bit of reining in on the creators' parts with dialogue and story, it's really a labor of love, shown in its well built combat system, an essential in this type of genre.