[SPOILER WARNING]
I like the medieval setting and I think with a bit more polish like more sound effects when picking things up, music etc. it will look really cool. I would love to get to know more of the story. So great job there!
I also like the concept of having to do the reverse of what you're used to, but it backfires when you instantly die from interacting with things. This discourage experimentation and makes the game more frustrating.
Reverse can also mean different things ex. in the puzzle with the runes I thought the reverse would be to press the buttons of the runes who weren't displayed, however this didn't work. I had to restart the puzzle to try again, which made it more annoying.
I think you should also pay attention to consistency. In the game's menu you have the button "Play" and the button "I know how to play". The "Play" button should be "not play".
I also want to mention that I got an error on when I pressed "Back to the game" in the pause menu and I had to reload the game.