I think this part might be bugged, can't see my character or progress any further but can move left/right slightly.
Also the statue at the beginning of the dungeon is missing the upper half of its body.
I've seen the game played further; you just have to continue navigating as an invisible player. I remember there's an ending, but not sure if I want to continue the game navigating like this... there's kind of quite a lot to walk around on for the rest of the game, and all in this invisible player state. (T_T)
EDIT: OK, never mind. I decided to give it a try, and just completed the game. Here are the details of what to expect: https://itch.io/post/7593504
OK, so I decided to give it a go after I replied to Aesica below. But basically, if you talk to your party, it will progress the game to the next map. Then, after the cut scene, you'll need to navigate to the top of the mountain in this invisible state until a boss fight. In the beginning, the controls seem weird and like you could be stuck, but it's possible to reach the top. This will be followed by the last boss fight and cut scenes (no more traveling, fortunately). I just completed the game :)