I did some tests today as yesterday I hadn't enough time to test it in depth and I found that there were some random crashes related to the enemy action. I've uploaded a fixed version that solves it. As it's already the 1st of April maybe the fixed version won't count for the contest but I upload it anyway as it is an open source game so everyone can get the code working without issues.

fixed version link: https://drive.google.com/file/d/0B3spY6Uo78flbkh0ZjJHSVFMX0U/view?usp=sharing