Hi Mord, thanks very much for your feedback!
Pleased you like the demo, are you sure you have visited all areas? :) There are six in total.
If you're wondering about the sixth try examining some "special" items.
There are secret walls in the game, try pushing up against some areas in the blackrock caverns and fortress. 
Also if you find crabshells you can sell them, theres plenty of items you can find and sell too - trust me the green key is well worth every bit of gold!!
Pleased you like the demo, are you sure you have visited all areas? :) There are six in total.
If you're wondering about the sixth try examining some "special" items.
There are secret walls in the game, try pushing up against some areas in the blackrock caverns and fortress.
Also if you find crabshells you can sell them, theres plenty of items you can find and sell too - trust me the green key is well worth every bit of gold!!