Crashes for unity games that are not common are usually caused by a driver issue. Updating windows and your graphics card drivers stands a good chance of solving your issue.
But it worked fine for around 2 hours straight and then crashed + won't open
I also updated my gpu driver just now and it didn't solve anything. I reinstalled the game on a different drive and also didn't do nothing. Idk
I'm sorry you are having trouble. There is currently a significant bug happening with the fluid decal system, with any luck fixing it will help.
