When you buy NumZumZero through the regular store channel, you will have to use regular old-fashioned cash to pay for your copy of the game.
Contact me (r2b2droiddev [@] gmail.com) if you prefer to pay using Bitcoins (BTC) or altcoins such as Litecoins (LTC). I will give you the current price in coins. If you decide to buy the game for that amount, I will send you the address for payments. Once payments are received, I will send you a copy of the game via the store.