Thee are no bugs that cant be fixed. Is a silly abuse, that of course should nto be posted here so more would abuse it. When game will be out it cant be abused this way.
I have noticed doing more damage to some enemies. Is there a rock/paper/scissor/lizard/spock thing going on?
Not really.
Altho TheMesenger campaign is easier to do with 5 speed so you dont hit walls all the time.
Maybe you used purple shield spell what helps you kill them since reduces their shield.
What is good is to have different spells. If you have 4 cards with heal spell will not work good together.