This was lots of fun! I think I might have bugged it a little bit, if I left two rocks in the forge and put a wood in, it would make a iron bar but not consume any rocks? didn't really effect gameplay though!
Was lots of fun trying to keep track of where all the resources were going and not waste any-
if you'd added the ability to upgrade buildings to e.g. produce different troops or resources you would extend the gam,eplay by a lot- player would need to make tactical decisions about long term vs short term investments etc.
overall very impressed! well done!