My first experience with Grandia was Grandia II as well but on PS2. I ended up getting the PC version as well, which at the time was fairly novel to see JRPG's on PC. Grandia II is still one of my nostalgic favorites. As you mentioned the typical turn based combat with positioning was a fun addition that could change your combat experience each time. Was like an evolution of the Chrono Trigger combat system.

I find myself designing a TRPG (Final Fantasy Tactics, Disgaea) with Grandia time & space mechanics in my head; take position even a bit more seriously than Grandia did, but build on a TRPG balance and skill structure. Basically end up with a much more dynamic take on the TRPG, which has always been a bit of a static experience. The canceling mechanics coming from Grandia would be banger in that sort of more dynamic TRPG.

There is, of course, a lot of games all around that space but I don't know of anything that quite matches what I'm laying out here.

(Although the cancellation mechanics would need some careful attention. It allows for a whole bunch of weak characters to keep a single strong character down by always cancelling what they're doing. I suppose just turning it into a skill check itself instead of being 100% as it is in Grandia would do the trick, though.)

Try the Lunar series. It has something similar.