If your game runs slow, turn on 'Dynamic Scaling'.

If your textures look blotchy and you would like a more crispier, grittier look, change 'Texture Filtering' to 'Nearest (noisy)'. It will remove the filtering which will result in pixelated looking textures. You can go even further and retro-fy the experience by disabling anti-aliasing. This is a matter of personal taste though.