Short version
C:\Users\your-username\AppData\LocalLow\Empyrean\House Flipper Game
Detailed description
Please open explorer window and check "show hidden elements" checkbox.
Then click C:\Users\,
pick your username folder, then choose AppData\LocalLow\Empyrean\House Flipper Game.
You will find your saves there:
I am using Mac
So you can find these files in /users/<username>/Library/Application Support/Empyrean/House Flipper Game