I was looking through “The Coins of the Indian Sultanates” by Goron & Goenka (GG) and found your coin. You are correct that it is two gani, a billon coin of Ala al-Din Muhammad, coin number GG D233. The weight should be about 3.5 g. The reported dates are 696-705 and 716. Personally I'm not seeing a date on your coin, but maybe another member can make out a date.