Here is how it works:
Basically, you have to boil your precious water, but while doing so, some undesirable things may appear. To avoid them, concentrate for a little while (around 4 seconds) and it should be gone. Rinse, repeat.
Now for hard mode:
If the thing shows it's actual face, just stare at it until it goes to another opening.
If it just shows it's eyes just concentrate like normal mode and you should be fine.
Just be careful, cus' hard mode IS kinda hard.
When I made this, I was a total noob at game dev. So yeah, sorry if the game isn't that clear on it's mechanics.
Have "fun" and good luck!