It's simple just go to the main door in the entrance of the house and it'll reach you to level 3, this game is pretty simple I'm very sorry but I just wanted to make something even if it'll look bad
EDIT: I'll work on the game as soon as possible and I'll try to fix some bugs, but I think I can't fix that bug that happenes when u finish the game. If you're a developer who uses unity u can help me in the comments and I'll try to fix it. Thank you :))