Okay, up for enter and shift for backspace? Why oh why would you ever have any desire to do this? Maybe there is some reason, but I didn't play long enough to find out. Typing the commands is fine, and this might be tolerable if you type with two fingers, I just don't see any reason to find out if I have to type something, stop, move over, hit the arrow key, then move back, type something else, move over, hit arrow.... you get the idea. You could have at least let enter and backspace function normally.
In light of the fact that I didn't play past entering the door do to the controls, I can't really judge anything except the controls and, well that is enough for me to pass on the rest.