RPGMaker XP is definitely a name I haven't heard in a long while, and one that brings back many memories! (Including my own first cancelled attempt at a game many, many years ago...)
The old RPGMaker assets definitely have a ton of charm and still hold up to this day, plus they work surprisingly well in an action RPG setting! That said, it was often quite confusing as to what was walkable ground and what was an impassable wall. Beside, while the attempt to implement Metroidvania elements in such a specialized engine is quite impressive, there's a certain clunkiness that can't be escaped when trying to force the old RPGMaker engines into any form of real-time gameplay. I think it would be very worthwhile to give other engines a try when it comes to making this kind of game. :)
The game initally kept crashing a few screens from the beginning due to missing a "Graphics/Panoramas/006.-Mountains01," but I was able to fix it by putting my own ,png file in that location. It was also quite unclear that the vampire was meant to be an unwinnable(?) fight, and I spent a long time plinking away at him before he finally put me in jail. Sadly, I eventually jumped into an unintended area from which there was no jumping back and foolishly saved over my main save through the menu, essentially bricking my playthrough.
Regardless, a cool little project that definiely earns a bunch of nostalgia points from me!