Hi, have you exported any maps before the crashes occurred?
Every time you export a map, it might generate some junk files in folder:
FeralHeart/media/particles
the files can be recognized from that they have a number in their filename (such as aura_0.particle and water_1.particle).
Those files can cause such crashes and should be deleted.
If that's not the reason for the crash, I can recommend trying to launch FeralHeart.exe from command prompt. This way you'll be more likely able to see the reason for the crashes.
You can do this by launching Command Prompt and entering these 2 commands to it:
cd C:/FeralHeart
FeralHeart
This will launch the FeralHeart normally, except that the console won't disappear after crash, which will likely show you the reason for it.