Hey! Really sorry you're having this issue.
Could you answer a few questions for me?
1. What OS are you on?
2. Are you playing from the Itch.io launcher?
3. Can you check the version in Options > Info > Version?
4. Are you able to find the log file for me?
Windows: C:\Users\<your username>\AppData\LocalLow\adamgryu\A Short Hike\Player.log
Mac: ~/Library/Logs/Unity/Player.log
If you can, can you search it for the word Exception and copy the text around it for me to see?