I wonder if somehow some antivirus is deleting a game file before it has a chance to start, similar with what was happening with BGT games. I'm not sure really where to begin debugging this error as you seem to be the only one getting it. What antivirus are you using? Also, as to bats, the trick is to time your jumps right. There is a demo in my anyaudio recording I posted above. Also, you don't need to get them but risking it gets you a lot of points. Yes, zombies can catch you in the air, you can not jump them.