Hi
First of all - Thanks for playing, I'm glad you enjoy it :)
About the instant death, I agree that healthbar seems little pointless in the demo. The idea was to show there is so no joke there, the other "things" I have planned for the game will not kill you instantly. But yes, this might feel frustrating, that you meet the most dangerous one at the beginning.
But I have already have taken this into the account, so before you jump through the mirror, there will be always a possibility to save game (already deep in development :) ).
Small sneak pick for you in thanks for your feedback:
So there is already added save point to Room 202 (where you find document in the drawer).
One thing I saw from your gameplay, that you did not use "run" in the game (right alt, if you are playing on keyboard, X on xbox controller) - which might made it more difficult for you than it should be.
You can see all controls in options at the start screen or when you press P during the game (which I tried to advertise at the beginning 0:16, sorry if this was not clear enough).
The game has some way to go, but there are big plans. I already have multi page document with locations, puzzles, creatures...
I will try to post updates from time to time, to show that project is not dying ;) (Given that, there will be people who would want to play it ;D )
Thanks again for feedback!