Its bloody good, but (unless i'm also being dim) after redefining keys to the good old QAOP, Space for fire and M for pickup (also tried M for fire, which worked and Space to pickup)... I couldn't pick up a cross or a green key, in fact, couldn't pick up anything (except usual food). Also, when redefining the keys you could do with a delay before the key for "up" is detected as i was often setting it as 2.
Fix it up and its a keeper :) Really great remake, not seen one in a while...