I can't find any more chests in the Glacier Valley, but I don't have the medal. I even checked on the walkthrough http://ayumilove.wordpress.com/2010/09/04/epic-battle-fantasy-3-walkthrough/
I have all those, is there something I'm missing?
I enjoyed the game but it took twice as long. for some reason, on wave 18, I lost everything attached to my ship. It sucked, but I don't see other complaints so it may not be common.
Otherwise I enjoyed the game.