Here are some ways to fix this:
1. Ingame, go to Options > Video > Rendering Subsystem > Click on OpenGL. Then restart your game.
2. Uninstall feralheart (make sure to put the files you want to keep out of the folder or it will get lost!) and reinstall it.
3. Update your graphic card. Sometimes the computer is old so make sure to upgrade it every few years. (also, if you have trouble playing feralheart or any game and the computer sounds like its overheating then put it on a desk/table or check the fan and see if you need to buy a new one)
5. Play feralheart on a another computer/laptop. If you don't have a another computer then I suggest buying a new one or a new laptop.