On the one hand: yeah, making a RPG, even in 2D, in a GameJam is an ambitious project (I did so in 3D ;-) It reminded me of games made with RPG Maker - if you made all the foundation systems yourself, wow! Nice that you have different music for every scene. And the descriptions of the things to find gave some background info.
On the other hand: I did not find the important elements you announced. No other characters (I pressed Q and E), not the "big intro text" - I read both signs at the portals but they didn't reveal much. I collected apples and flowers but they didn't seem to have a purpose and they did not appear in the inventory. Nothing was there.
I had no stats, too. The whole blue window was basically useless.
The save dialog is cruel: "Do you want to save? <pressing Z> Sorry, not implemented". Why do you ask when it's not there?
I stumbled into the mine by chance. There was no hint outside that this one rock could be an entry while the others weren't. Inside the left passage was blocked, combined with an ominous warning in bigger letters. I could do nothing here. And I could do nothing at the lever, far left outside.
Ok, there maybe is a great RPG behind all this, and obviously some other players found more. I used the web version, maybe the download version is different. I have played many RPGs but got stuck here. So I think the onboarding should be extended.
I really tried, read all info texts I could find, walked to all places the cute dragon was able to reach, but that's all I found.