The goal is to kill the Red Dragon on the 10th floor of the dungeon.
Tap tiles to explore
Tap monsters to attack
Visiting the tavern costs 100 gold: it heals all your heroes to full, and you will get 4 random heroes (possibly some of the same ones) with which to continue through the dungeon.
There are currently 6 different heroes and 11 different monsters.
Alpha test build for the Trials of Oryx contest: http://oryxdesignlab.com/trials