I'll explain a bit the "random" part (which, I know, is frustrating) :
When you open your eyes, you are visible both by the Monster and by some "watching trees". These trees can give away your position to the Monster (the big scream you hear). The Monster then runs to this position.
If you keep your eyes open, you are visible, and the Monster can see you (if it does, it will run towards you and kill you).
If you close your eyes, you become invisible, but your "last known position" remains. The Monster will still go to that position.
The "random" part happens when you are seen by the trees, then close your eyes. The Monster goes to the position where you have been seen, then moves around this position. If you close your eyes and stay still, there is a chance that the Monster bumps into you (it means Game Over).
My advice would be to always keep moving after closing your eyes.
We are not planning to update the game for now (unless it gets a crazy amount of attention somehow), but what we could do on our side is to disable the collisions with the Monster when your eyes are fully closed.
Maybe it would be too easy though.
Anyway, thank you very much for your feedback :-)