You've certainly put a lot of work into this demo :) I liked the event indicators and the hint item, although it felt like a lot of clicks for what was basically a one line reminder of what's going on, so does maybe need to be streamlined a little.
Can't really comment on the battle system, it's not really my area. I got kind of fed up facing the same two bats over and over though, and ideally you'd still be able to escape from those in case you've accidentally touched one. They respawn which made backtracking maps annoying. EDIT: Forgot to mention that I found this passability error;
The titlescreen doesn't actually work with a gamepad which you might want to look into if you're promoting gamepad controls. There were a few typos around that could do with fixing (p.s. it's spelt "brooch" not "broach"). You also hit two of my pet peeves, first that text doesn't fit the width of the textbox correctly, (ideally fill out an entire line before starting a new one, unless it's stylistically between sentences), and also I felt that you'd overused pauses a little making the dialogue more tiring than it is.
Final thing I'd suggest fixing is the menu. Since you can't see the MP bars, it makes it hard when you're trying to use MP restore items from the menu. Sure, the player can check status but it's not user friendly.
So, I did end up getting stuck. Your puzzle hints at 17 boulders to open the door. I found 7 and turned all the switches on, but still wasn't able to get past. I did look around for an area that I missed but didn't see anything. This was around an hour in, so I probably would have stopped playing at this point. It's a good game, but a bit too battle heavy for me and not really my genre anyway. Good luck with this! <3