Game is just hard on your first playthrough, it is trivial when you figured out algorithm to beat enemies or specific rooms. Only real danger is you getting bored and trying to end things quickly
I didn't like the checkpoint system. as soon as you get damaged, it is really hard to fill your health back and being able to place a check point. my general game play was to suicide when I get hit because there was no point in continuing any more since I will probably die before I am able to put another checkpoint.
I found a chest but couldn't open it. Then found an door that I can't open and stuck :(