There is a known bug that we are actively working on solving, mainly affecting players on Windows Mixed Reality but also some players using TPCast, where the game crashes immediately after the splash screen. This is caused by a third party library used when synchronizing audio with mouth movements for the Reaperman.
To solve:
Open the folder C:\Users\\AppData\LocalLow\Odd Raven Studios\Carly and the Reaperman and find the file settings.ini. Open it up in notepad and find the line sayingaudioToMouth=1
and change it toaudioToMouth=0
This will turn off the audio/mouth synchronization.
Another way of solving it is to make sure there is a microphone attached to the computer, which will allow audio/mouth sync to work.