Hey!
Thanks for taking the time to leave some more feedback, this is incredibly helpful to us, seriously!
1) We definitely messed up the balance in the last update... Good news is we are already working on it for the next update. We have redone the waves so that the are more of a challenge. We're also testing a new idea for the flag. The player will start with a tower in the center they have to defend. Each time an enemy reaches the tower they enter it and it loses 1 hp out of say 15. We would be really interested to hear what you think of it when the next build comes out later this month!
2)There are certain things we really like about the new card system but yeah that are quite a few things we miss, we're brain storming some new ideas for it to hopefully find something good. Multiple waves like you mentioned is something we are considering, thanks for sharing that idea!
3)Lack of stonewalls is a problem for sure. Currently what I'd like to do to fix it would be to add multiple new card picks between levels so you might get to pick between some of the unique cards, then also get to pick one of the basic cards to add as well.
4)That's a great idea! I'll go ahead and set that up