I'm in agreement with the above post on fight #1 for redropping totems. The totems inside are only meant for a potential rush so you don't have to waste time dropping them when you need to be putting pressure on the enemy.
As well for the first fight, I might of missed it but assist your healer in keeping you alive If I don't drop a target in 1-2 Lightning Bolt Volleys followed up a Chain Lightning and Earthshock I make sure my health levels are good and usually switch off to a new target.

On the last fight, you saw your mistake, but your healer needs to work on positioning as well. He sat there and got Mana Burned completely, just needs to utilize pillars and LoS objects.

Overall I really enjoyed the movie and you'll be at the same level I'm at in no time~!