Ah, i thought its a one time fix. Wellp. We'll see if its defendable then...
The amount of corruption at these waves is almost un-playable with so few players. It was designed that you would need 10x this number of players at this wave. There will be a fix coming in the next hour, but I want to try and time it with finishing this wave, to avoid griefing the players who have invested so much time in wave 22.