This is an very though out game but you made it alomost impossible to beat. I guess through playtesting you just got good at it and forgot to scale the difficulty. I get it sometimes we devs forget ourselves.
I almost beat the nightmares level but the speed rate of spawning entities was unmanageable and I died even after the 15th attempt. The hand thing was good but it make me constantly stick to the same place making it easy for the footsteps to get me. I would advise you to remove the footsteps and explain the window part. It will get the message across most people and the level would be managable.
Another thing - at the beginning add a visual cue for the E button because I had to press every button on my keyboard to see witch button is the interact one.
Overall it was a solid game and a good entry.
Cheers!