Okay, I should point out that I'm not a fan of dungeon adventures. They really need to be very good or very different to retain my interest. You start with a great selling point - an isometric drawing. So, it's a shame that the illustration is rather small - why not enlarge it so that it covers the width of the page? Then you could even fill in the gaps in the corners with other motifs or possibly even with text. Also, isn't putting the items in the illustration rather too helpful? Especially as you can see exactly where you need to go - so you lose one of the major attractions of a dungeon setting.
I found the battle rules very confusingly written (not to mention rather lengthy). If the order is determined randomly, then why does the opponent always roll the dice to defend? It seems to be written as if there are two players in the game, rather than the player character and an enemy. And exactly how many dice are rolled to attack or defend? It doesn't state. I suspect you mean a single die - as the table refers to '1 die' for Battle form - but I can't be sure.