So to begin with, I love the game. I fully understand the need to generate revenue and create 'pinch' opportunities where players such as myself decide to reach in their wallet and buy something. That being said, I just lost the final battle of 'Highway Robbery', where I was prompted to spend 25 gold to retry the battle or restart the entire adventure (consisting of 4 battles!). I didn't have 25 gold, so I opted out, wasting an hour of progress. Since you don't appear to gain XP between battles in a 'module' (which is exceedingly lame), I basically got squat for the time investment. While from a product manager's point of view this is probably a great way to force players to pry open their wallets, I expect that you'll lose a ton of players this way. There are a lots of better options for you in which to monetize players, such as making chests that produce loot of the player's level (I'm level 3) rather than stuff at level 1-15 which is mostly useless to me right now. It's a great game though. Conceptually brilliant and nicely produced... bravo!