Contents of this update:
1. Fix a serious bug in the 1st chapter: When you jump to Grandpa, there may be bugs that will make the game impossible to continue. This may be caused by the lack of support for the shader in some video cards.
2. Fixed some minor bugs in the 2nd chapter, and made some minor adjustments. Rest assured that these adjustments will not affect your game progress.
3.9 Update the announcement
Source: Steam Community (opens in a new tab)