Hi, Now the game is working and I found the key under the mat so do I use the door or somewhere else and I found mini ladder when I use a ladder somehow I ended up on the roof it probably wasn't meant happened lol 
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If you have the key, you can enter the house through the front door by the doormat, you click on the dooor to unlock it with the key then you push it by walking. The game is based on a physics engine, and aside from the map borders and some plot steps, I've chosen to give players the freedom to do whatever they want and explore freely. Unless you found a way to fly using the ladder—in which case I should fix that bug—there’s no problem if you just used it in a creative way to get onto the roof. Thank you very much for your feedback.