You have 2 issues:
1) Line 122 in main.c
must be
2) You have some static data on your code and the jo_engine is slightly bigger than before so you must reduce the size reserved for malloc like the shooter demo.
More, you don't use jo_malloc() so... :)
To do that, you just have to add the line bellow in your makefile
JO_GLOBAL_MEMORY_SIZE_FOR_MALLOC = 262144
Now it works perfectly :)