Thank you. The new version (1.0.3) should solve this problem. If you still have a save from right before the error occurs (basically, the image that you show, where a heroine says "Good luck"), and play from there, the error should no longer occur. But in any case the bug should not affect anything beyond the mission of Puss, and even that mission you should be able to play correctly (albeit not alone).
If you want you can delete the posts on the error, as I have copied them. Or I may delete them later.