Hooray! The long awaited update is here! This was a hard one. Phew! But the epic battle with the castle master is finally in the game now.
It still needs a lot of polishing and the transitions between the phases are quite rough, but it is functional. The potential for improvement is high. We plan to add more mounts, more power-ups (we only have health-up now) and more variety to minions in the last phase.
I cannot comment on balance... it's probably pretty broken, so be prepared for anything. We managed to beat it with adventurers and battlemages quite easily. Warlocks are probably screwed right now :). There are some exploitative strategies, but it was too much to take care of everything in this update. So take it as the first iteration.
Let us know, what you think and throw your suggestions in discussion board as always. Have fun!