In case anyone is following development: This morning, Bitstrat switched from testnet coins to real bitcoins.
A game has already been played for real coins today, (0.1 BTC) yay!

Also, the game balance has been modified:
Tower damages and prices were doubled. (proportionately)
The game creep capacity per path is 500. (down from 1000)
Higher income on weak creeps (rats 2.5% ROI) ... lower income on stronger creeps (destroyer 0.5% ROI)Same loot (prize for killing a creep) for rats (50% of cost) ... lower on stronger creeps (30% of cost for destroyer)