If you like Invisible Apartment, than you might also like Angels & Demigods.
http://store.steampowered.com/app/503160/
Angels & Demigods is a VR Visual Novel, but you can also play it on your desktop if you don't own a Vive headset.
It's free just like Invisible Apartment 1. It is fully voiced and available for Windows and Mac.
Angels & Demigods is also running a crowdfunding campaign to make enough money to fund the production of next chapters. Head to Kickstarter to discover what cool rewards you can get for backing :)