Problem with game crashing

[Jyuu]

When I start the game I can play normally, but after the opening the game becomes laggy. It takes very long to load, and when it finally loads, it crashes after some seconds, showing a Unity error window, or a message that the game is not working.
I have already tried lowering the resolution the most as possible, and it seems the game has become less laggy, but the crashing persists.
Any help would be appreciated, thanks!