That's a good thing to point out. I've got some ideas on how to make getting hit a little more punishing since right now you can just tank through attacks and cheese enemies a bit.
That is indeed intentional! There's a puzzle going on in that room that involves taking a specific route when going into the dark part, but both from your and other player's feedbacks, it wasn't made very clear what's going on there. We're gonna work on that.
Thanks for checking the game out!