Hiya, this looks pretty awesome! I've never played the original CDi version but playing through this felt like a standalone game or romhack, loved the overworld exploration.
I did run into a few bugs (v1.3.0) that would be good to look into:
1) game crash on selecting Continue on the title screen after a death. Seems to only happen after save and continue was selected? Reproducable on emulator (bgb 1.5.9 and gambatte-speedrun r717) and browser version by: starting game -> select new game -> open menu, save, save and continue -> lose all health to get back to title screen -> select continue. Brings up an undefined opcode error in bgb, and a kernel panic in browser.
2) halfway through the game your location indicator on the map started disappearing (or moving far off the location), and shortly after all text of the game disappeared (was playing on gambatte-speedrun r717 emulator at the time, haven't tried browser or other emu to reproduce). Map indicator disappeared after entering Vendoss from the top right (somewhere in the top sides of the town area it seems), text was still ok at the time. After exploring to Great Dry Canyon I encountered the Ambi sprite which did not have text shown, at which point my save file also seemed to be corrupted enough: I run into a game crash on loading (on game reset), or not recognizing the save file at all (with a save & quit, no text on title screen. Selecting 2nd option opens up a text box with no text and then returns to the new game / continue selection). Video with timestamp entering Vendoss where the map indicator was still there 2:09:15 https://www.twitch.tv/videos/1807262319?t=2h9m15s and 2:11:10 it is gone. Text is gone at 2:15:31.
some minor things that didnt seem game breaking, is that I did notice the location indicator in dungeons was sometimes not entirely accurate, and sometimes enemies dropped invisible items that I could pick up?
Can't wait to get back into it, even though I lost some progress I love to explore more!