this would be a five if you didn't have to hit R to reset. how do you think people are playing? do you think they are sitting with both their hands on the home row like dutiful typing class students and moving their right hand to the arrow keys?
or do you think they have their right hand on the arrows while they lean into their desk to relax?
how could you not anticipate that this is the way most people would play?
so suddenly you have to activate your left hand rather than relax.
very stupid.
basic design philosophy: don't add keys to the arsenal unless required. guess what? could have reset level with "any key" or "up" for reset and "down" for checkpoint or something.
not hard to design properly.