First of all I am happy that you enjoy the game. Thank you for the detailed bugreport. I can't tell you what was going on with the sound but I solved the reason why your game crashed. The problem is when you restart the game all objects will be deleted but always in a different order and some ojects still run their code while others are already deleted. The background alienbones object wanted to communicate with the lighting object but it was already deleted. So I now had to change it in a way that the bones ask if the lighting object exists before they run their code. I guess this bug is solved now. But I can't guarantee that similar bugs won't appear, luckily this kind of crash is not so problematic because you won't lose any progress.