The monster has a 5-second delay before it starts chasing and attacking. Just run inside and go straight to the 2nd floor—the aggro will be gone by then. Thanks for playing the game! :)
Okay I've done it ! I think the game will be better if the monster is just a jumpscare instead of being a camper XD
Otherwise the game is quite good, really basic and super easy when you understand that you just have to ran past the monster and hide before it actually sees you. But yeah in the end it wasn't that bad, good job !