So while playing I windowed the game for a bit then fullscreened it again, and it went all color-weird, so I windowed it again and fullscreened it again (usually takes care of random color issues) after that clicking to move forward would make me move diagonally. How can I fix this problem? If I load a previous save it's fine, but I'd rather not since the most previous save was from a while back and I don't want to do all that over again.

Use the button to center your view.