First check your particles for doubles. Right click FH icon on desktop click open file location click media then particles. Anything ending with _0 or _1 needs to be deleted
Another tip is to change your rendering system if you continue to crash. To do so, go to your main FeralHeart folder and scroll down until you see a .cfg file called "ogre". From there, open up the notepad and it should say something like this.
Change the highlighted words to its opposite whether it'd be OpenGL or Direct3D9.
You can also check them [computer specs] out through the DirectX Diagnostic Tool if you use Windows. Go to Start (lower left button of your desktop), search "Run," and enter "dxdiag" when prompted. A program will automatically startup with a list showing your computer's GPU, RAM, and other valuable information that can help us solve your problem. You should also be able to view your computer's basic specs by visiting the Control Panel and visiting the "System" section. Try if you can do both methods because I do not believe GPU is listed in the control panel. If possible, please post a screenshot or list the details of your computer's hardware listed, specifically the RAM, CPU/processor, and the GPU/graphics card.