thanks for playing! I had a lot of fun making this, and it's nice to know that it's being enjoyed by folks!
I did use ProBuilder, yeah -- it was my first time using it, and it's pretty darn handy.
and yeah, the issue(s) you encountered are likely from a PlayerPrefs issue I ran into last-minute -- I tried to get the most important part to fail gracefully (checkpoint saving/loading), but mouse sensitivity and audio settings had to fall into disrepair haha...