Runs fine here. Ideally, it's a bit big for a minimal example. But oh well.
Only thing I ran into was a NullPointerException when disposing Sounds.music1. (In Level.OnKeyPressed. Simple fix of checking if it isn't null before calling Dispose)
I also didn't get any messages about optimal resolution. Though, I have a different system spec than you.
Does it still happen if you don't run in Fullscreen? (ie, Styles.Default)
You have quite an old graphics card. My best guess is you're running out of graphics memory. Unfortunately, the only thing you can do is load less really, as far as I am aware.
Since it's old enough, you could try making sure your textures are all power of 2 in size. I would also change to windowed mode, or change your window's resolution to 1366x768.
Unfortunately, without more information about the crash, I'm only guessing at this point.