Dark Savior is an 8.5/10 RPG if you can forget that it's not meant to be a sequel to Landstalker. Some of the platform hopping in DS is extremely challenging.
I just hated the battle system, but I imagine that was popular in Japan, so I can live with it. The graphics are really great for a 32 bit console too. The art is very steam punk-esque, and Bilan looks awesome. Imagine someone trying to hunt down that thing. That's Garian.
The story was probably clarified in Japan. Nevertheless I think an actual timeloop is possible because the warden of Jailer's island started experimenting with Bilanium, which is what created Bilan in the first place.
It's a tragic fate. Garian was actually worse than all the other prisoners (in that Garian was a better killer than them), and they were evil mass murderers. The fact that Bilan's origins are explained in the game suggests that this might have been a battle for Garian's consciousness in which Garian would always win.
I still don't trust Jack though. The other bounty hunters didn't like Jack either because he was sent by the "agency". There's more to Jack than meets the eye.