Hey there!
We're so glad you enjoyed the game!
Thanks to yours and other comments, we've detected that the last bug-fix we deployed (that fixed several other things) broke the ending!
The demo doesn't end when Diane and Zak "just" get out of the VIP Zone, there's also de "getting out of the Disco" and the Epilogue left for you to enjoy! We're fixing the bug right now, there should be an update very soon.
Cheers,
Entalto Studios