I actually added a buttom prompt when I started working on the project but ultimately decided to remove it to encourage players to try and interact with things on their own. There's not much you can interact with right now but I plan on adding more. I don't know if you managed to find the secret walls in the dungeon, there are two of them. That said I'm making sure that interactable objects are obvious for the player to notice.
Yeah there's no jumping in the game, that would break the atmosphere and gameplay.
Thanks for playing and the feedback.