Like a lot of “doujin” fighters, it's simple in design, with three buttons, easily performed moves, and not much game balance. The programmer(s) replicate the PlayStation game's sprites really well, making them just a bit larger, and the fan-art character portraits look better than some professional game illustrations. It's all a pleasant diversion, especially for Valkyrie Profile fans.
It's not quite a fighting game based on Les Miserables, but Valkyrie Fight Tag's worth whatever download arrangement The Underdogs runs you through. A pity it's not a fully licensed tri-Ace game, or it might've ended up in the PSP version.