Dragonstone is a pseudo-sequel to Darkmere, and it has a similar look and feel to the Legend of Zelda series. Agon is the villain whose hordes you must destroy. The game is split across 7 multi-directional levels, taking in forests and caves in a fantasy setting.
You are armed with a sword and a special energy-bolt attack, which can be charged up. Some vanquished enemies discard food or gold; there are shops in which to spend this. You will need these resources to progress through the game and eventually face off against Agon.