So you're telling me that I cannot save my game after playing and progressing too much?
Viewing post in Mousetrap - WISHLIST ON STEAM! comments
Not unless it's well after doing both the quest line that is first outside the left door of the building & the questline that starts in the backyard/hedge maze gazebo. I also noticed a few times while sneaking through the building a small pop-up in the corner of the screen that says "checkpoint...?" like they're placeholders for further updates.