I just put Namco Museum Volume 4 on my PSP and have been playing the hell out of this game. It's frustrating at times, but I really enjoy the music, artwork, and even the somewhat-derpy character sprite animation (is that hardware rotation I'm seeing on the arms/sword??)
Does the PC Engine version compare well to its arcade counterpart? It's a pretty inexpensive game & I'm curious as to why that is. I've seen far worse games go for higher prices.