Congrats on your release! Looking forward to the The Waking Cloak.
I haven't read the other comments. Maybe I'm repeating something.
I liked the game overall but I have a comment about puzzle progression:
After getting the swap scroll it would be nice to have a very simple test of the mechanic to let the players get used to it. For example: In order to exit the room, there is a pot that blocks the door and you need to swap with (a single shot). Afterwards a room that requires two shots and then introduce mirrors, etc. It was not the case back in the 90s but nowadays I guess is the expected way to introduce new mechanics.
I think the item in level 2 pretty much destroys the dungeon. The puzzles have a great design for level 1 but are trivial for level 2. Maybe all these puzzles should be mandatory in level 1 in order to get to level 2. Or you could consider nerfing the weapon for example by only allowing the ball to turn at certain tiles (maybe only can change direction when touching a wall instead of mid-air).
I played for an hour in total but I had to restart the game twice. The first time I had to stop after 30 minutes because of an appointment and later I there is no save feature. After work played again but after some time I got stuck. I think I fell through a hole while moving in diagonal and I got stuck in a candle :( I believe that games that lean on the puzzle side should have a button to restart the current room. It would also fix my stuckness. The third time I was much faster and finished the dungeon in ~10 minutes. I found a hidden lake with a weirdo in there.
I can't talk much about the difficulty because I published a puzzle game with a similar mechanic in a gamejam couple years ago so the solutions looked quite obvious to me.
I played with an USB Xbox controller. Evertyhing was smooth besides when I got stuck in a candle.
Bug? It looks like you can move a bit the character while the screen in black in the intro so you can make it fall in a different place. That was my impression, I may be wrong.