I just played it twice.
The first time, I navigated from door 1 to door 4, only finding treasure chests, and reached the exit. I felt I missed something, so I tried again.
Second time, I was lost, I didn’t understand why I couldn’t leave the rooms, and when I got the key or the lever, ended up in the same room doing the same thing. In the end, I got the second ending.
You maybe should add some kind of thing (animation, text, etc.) to make it more clear that it’s something (para)normal.
The idea behind the game is good, it sure needs more polish, but it is highly playable.
I always love when a game is not what I expected it to be.
Good work!