In the cave you have to activate some elements to open the way ;)
If the installation went well (you do need admin rights to install), you should find the executable at this location :
C:\Program Files (x86)\Intertwined
I hope this help.
We would like to thank everyone of you guys who played the game, posted playthrough, gave feedback and enjoyed it !
Be sure to share/retweet this tweet that could allow us to participate to the Unity Awards. https://twitter.com/isartdigital/status/1037377360969039873
Again, from the Intertwined Team, thanks !