Download Processing 3, and open procjam2.pde in Processing 3. Then press Run (play button in the upper-left). I'll also try to create a stand-alone version of it so that people don't have to go through this process and stuff... it's a little complicated, since it involves the saving and loading of a file, and I think the paths work differently when it's a stand-alone application or something... it's weird. I'll try though! And sorry for taking so long to reply...
I'm having the exact same problem with the Mac version! Weird tile colors, grey sprites. It would be very appreciated if someone could help us with this problem...
