I enjoyed playing this quite a bit. Sadly I 1-shot Berserk'd my entire team right before the king. Oops.
The game has a lot depth to it. In a way it reminds me of doing dungeons and raids back in the WoW vanilla days.
The fact that movement is free-form instead of grid based makes positioning and tactics around that interesting and playthroughs are more varied.
I'm sure you're aware of the issues around the UI when all the characters are clumped up but I'd suggest adding character portraits to select them instead of having to select them by clicking on them in the playfield.
I had a lot of fun with this!