'Yggdra' is pronounced 'iggdra'.
And the game plays somewhat like a combination of fire emblem and ogre battle. You take two units and fight each other, and if one unit kills all the other units in that battle, the loser takes a hit to it's Morale, or essentially, it's health. When Morale drops to 0, the enemy dies.
And yes, it's made by the people that made Riviera but it's not a sequel.
ROMs are illegal and everyone that downloads them should go to jail.