Thank you for your feedback! I really appreciate it!
It sounds strange that you're not able to attack while moving diagonally. May I ask you what browser you are using?
As for the player's attack, it's one pixel (supposedly) at the point of the sword. I might have made some miscalculations though...
Thank you for playing, and maybe there will be a sequel some day. Game of Jam II: The return of Lord Evil...