I finally had the time to try out the Fighting Force (Judgement Force/Streets of Rage 3D/Metal Fist/Whatever...) prototype and, oh boy, am I glad that we could finally put our hands on this beauty. The first thing I noticed was that, for an early version, this game both plays and looks very good. It has good graphics and, more importantly, the framerate is both fast and constant, so no slowdowns or slow gameplay. Speaking about gameplay, the game offers more options than your average brawler. Besides kicking, punching and jumping, you can also do a special, rotating attack; punch behind you (useful when surrounded) or charge against your enemies. There are also some weapons, but I couldn't get firearms to work, only clubs and the like.
Other than that, I can't really comment on the similarities and differences between this and the final PSX version because I haven't played that game in a long time, but a lot of the stages seem familiar to me, like primitive versions of what ended up in the final version. It was definitely a shame that this one got cancelled, it would be a blast for any Die Hard Arcade fans since they both play very similar, but at least now we can have a taste of what that would be like.