Holy moly. I've been playing this for the last three days and can't congratulate you enough for this game. It's amazing. At the begining it is quite unforgiving, but when you get the hang of it and access to more runes, spells and stratgies it becomes a blast to play.
I'm a big fan of metroidvanias and loved how you mixed up the Chrono Trigger sort of battle style with the exploration back and track from Castlevanias. Also, the NPCs and dialogues are REALLY WELL DONE. You got a lot of talent narcodis and learning that you started this at least 13 years ago was impressive.
I found some game breaking bugs, yeah, it happened at least two times. Once in a transition in the lower part of the city, where you appear in an unwalkable spot and the other one was at the waterways. Below the main room (where there is a "puzzle" with a moveable boulder and statue heads), the boulder won't respawn when you leave the room and go back again. I'm very happy that I didn't saved after that and just reloaded the game.
I still didn't passed one puzzle specifically (the rusted lever where you use the Solvent). I just can't get the wooden box in the right place to go into the next room. I just can't.
And can't say I got a little sad when passed the gelatinous cube.
Besides that (and don't take these complains very seriously), the game is a masterpiece in RPG Maker games. The best one I've seen and played in a LONG, LONG, time.
Congratulations. And yeah, waiting for the next levels. Please, don't leave this project in the dust.