This is good. Have you considered using github to make collaboration easier?
I don't use git though, I use mercurial.
Anyways, version 0.2 is up... you can resize the map window, the depth is displayed (as a tooltip in windows, as a separate label in osx), and you can use the arrowkeys and pageup/pagedown to pan and zoom.
I'm going to be adding a menubar with toggle-able options.. I'll use your cave-mode patch when that gets implemented. Thanks.