Can you add my friend and I? I'm Pardus79 and he's BlitzM4.
Done! You can now use real bitcoins with these accounts
Dooglus, I think you made a mistake [...]
How dare you!

You have to right-click your bet to collect your winnings. When you hit a mine you lose your initial bet plus any winnings so far.
This makes the game really bad value. Every dig gives 20% of your (bet+winnings) to the house on average. That's 7.4 times worse for the player than playing roulette, which only takes 2.7% of your bet each spin on average.
It is correct that the game has a 20% edge. What I am working on at the moment is a jackpot payout to Minefield. 50% of losses will go into the jackpot. When a player hits every square but the remaining mines, he wins the jackpot. ((Player Bet/Table Max)*Jackpot)