JOFL difficulty?

Hello!
So i watched a playthrough of Scenario 1 and reeded all the rules before playing and completed scenario 1 in like 15/20 min with no brains. My red Guardian was at 2 Life, but i feel that my Hatchet could easily kite and kill and the mobs with no problem.
My question are those:
- How much in difficulty will the game increase over the scenarios?
- Are the A,B.. cards more OP?,
- What is the general turn count timmer? How many max turns do i have if i have 6 cards at the start?
- Is there a way to increase mob difficulty?

All of this, because i want really high difficulty in the game. I finished Scenario 1 and i wanted to start Scenario 2 right after, but i don't want to end the game fast xD I really want to stop and think for some time before doing my moves, and on this first scenario experience i just dropped cards "without thinking".

Thanks!