WOW, your game is getting pirated. This must be a sign of success: game sells well enough so Insanity's Blade gets known and crackers notice. I was always afraid of this for my game and can only think of day-one patches then frequent updates as a remedy:
- Don't bother with copy-protection, except the obligatory ones, like Steam
- tire out crackers
- introduce "desperately important" new features in updates.
- So people, who pirated the game probably won't have patience to wait. Instead they go and purchase the game, because the latest crack with the "desperately important" new features are getting too late and as you post even newer changes people can't wait anymore and go to your store page.
- Maybe compile an EXE for each customer, embedding a "serial identifier" so you know, who uploaded their version to the net = gave the game to a cracker.