I am seriously impressed with how much you were able to cram in 2 months. It's pretty clear you guys have been working together for awhile. I may find an excuse to keep playing this...
--On to the issues--
What tripped me up the most was figuring out how to get back to my avatar after clicking the fire button. Thought it was a game-breaking bug until I found the focus button. I did read about it in the instructions but apparently forgot. To idiotproof this: Perhaps make the move keys re-focus back to the player after clicking the fire button.
On Linux a couple files needed to be made executable. I guess zip files don't preserve Linux permissions unless a special parameter is set. I've always just tar'd them first. Also I was able to rename the nw file and it still worked, so I suppose that could be changed to something more obvious.
Commentary: