Thanks for playing! Yeah I deliberately made the double-jump only work when falling, but having played other entries now I'm thinking that might have been a mistake... I love the way that your game uses checkpoints and has more consequence on death - I might have to "borrow" that concept for my post-jam update :D
Good spot with the ceiling bug - I had thought that I'd managed to remove all of those, but that one must have slipped through... I'm curious about which parts you had to die to get out of though... I can think of 2 areas that force you to do that, which I think I can change a bit... There's a forest room that has a locked door to the caverns, and a mountain room with a drop down the right side that you can't get back up again without the wall jump. Are there any more?